The parental genotypes are AA x Aa. (AA X Aa) represents the correct parental genotype. The correct option is A.
The given alleles are a and a.
The allele a is completely dominant to a cross between two individuals produces a 1:1 ratio of phenotypes in the progeny.
If we assume that one of the parents was homozygous dominant and the other parent was homozygous recessive, then all of the progeny would show the dominant phenotype.
However, we are given that the progeny showed a 1:1 ratio of phenotypes. This means that one parent was homozygous dominant (AA) and the other parent was heterozygous (Aa).Therefore,
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What is the difference endochondral ossification vs intramembranous ossification?
Endochondral ossification is the process of bone formation by replacing cartilage with bone tissue, whereas intramembranous ossification is the process of bone formation from the transformation of mesenchymal tissue into bone tissue.
Endochondral ossification is the most common form of bone formation in mammals and begins with the formation of a cartilage template in the shape of the future bone. The cartilage is then replaced with bone and marrow in a process known as calcification. Intramembranous ossification occurs when sheets of mesenchymal tissue are replaced with bone tissue directly without the formation of cartilage. This type of bone formation is found in the facial bones and the flat bones of the skull.
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Translation involves all of the following types of moleculesexcept:aDNAb amino acidsСtRNAd mRNA
Translation involves all of the given types of molecules except: (a) DNA.
Translation is the process by which the information encodes in the m-RNA is translated into a structure called protein. Proteins are the actual functional parts of the gene which are made up of amino acids as the monomers. The process of translation occurs in the ribosomes.
DNA stands for Deoxyribonucleic Acid. It is a major genetic material present in majority of the organisms. The structure of DNA is a double stranded helix joining together by the hydrogen bonds between the nucleotides. The role of DNA is observed in process like replication and transcription but not in translation.
Therefore the correct answer is option a.
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approximately how much dna is present in a single bacterial cell? multiple choice question. a few micrograms (10-6 grams) a few nanograms (10-9 grams) a few picograms (10-12 grams) a few femtograms (10-15 grams)
A single bacterial cell typically contains between 2 and 4 nanograms (10-9 grams) of DNA. The correct answer is b.
Approximately a few picograms (10-9 grams) of DNA is present in a single bacterial cell. Bacterial cells are prokaryotic cells that reproduce by asexual reproduction or binary fission. Bacterial cells are among the most complex cells in the world. Bacteria do not have any intracellular organelles or membranes, and their DNA is located in the cytoplasm rather than a nucleus.
DNA content in bacteria ranges from less than 1 femtogram to more than 20 picograms. In a bacterial cell, the DNA concentration is frequently 1000 times greater than in mammalian cells. Since a bacterial cell has a smaller genome than a human cell, this indicates that the DNA is more tightly compressed.
The DNA is twisted into a helical structure and packed into an area called the nucleoid. Despite the fact that bacteria lack a nucleus, their DNA is still arranged in a compact, organized manner. The DNA is wound around histone-like proteins that function as architectural supports, similar to the way human DNA is packaged around histones in the nucleus.
The DNA in bacteria is much more compact than the DNA in human cells, allowing it to fit into a smaller space.
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if the mitochondria and chloroplasts in eukaryoticells resulted from endosymbiosis, what features might we expect these organelles to contain
Mitochondria and chloroplasts are organelles found in eukaryotic cells. They both contain their own DNA, are involved in energy production, and arose from endosymbiosis.
What is endosymbiosis?Endosymbiosis is a process in which a smaller cell is engulfed by a larger cell, and instead of being destroyed, it forms a mutually beneficial relationship with its host. It can result in the formation of a new organism or the creation of new organelles within an existing organism.
What features might we expect these organelles to contain?Mitochondria and chloroplasts are expected to contain the following features:
1. Their own DNA: Mitochondria and chloroplasts have their own DNA, which is different from the DNA present in the cell nucleus. This is because they originated from free-living organisms, and the DNA was retained when they became endosymbionts.
2. Double membranes: Both organelles have a double membrane system, which is thought to be a result of their endosymbiotic origin. The inner membrane is where the enzymes responsible for energy production are located.
3. Energy production: Mitochondria and chloroplasts are involved in energy production. Mitochondria produce ATP via the process of cellular respiration, while chloroplasts produce ATP via photosynthesis.
4. Endosymbiotic origin: Mitochondria and chloroplasts originated from free-living bacteria that were engulfed by larger eukaryotic cells. This is known as endosymbiosis.
5. Size: Mitochondria and chloroplasts are generally smaller than the cells in which they reside.
6. Reproduction: Both organelles can replicate themselves independently of the cell. This is because they contain their own DNA and have their own protein synthesis machinery.
7. Membrane-bound: Mitochondria and chloroplasts are membrane-bound organelles. This means that they are surrounded by a phospholipid bilayer, which separates their internal environment from the cytoplasm of the cell.
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Action potentials appear to jump down a myelinated axon. This is called:
a. signal conduction
b. electrical communication
c. excitation
d. saltatory conduction
e. propagation
A myelinated axon appears to have action potentials jump down it. We refer to this as saltatory conduction.
What is the term for the action potential's conduction in a myelinated axon?The process of action potentials moving more quickly from one Ranvier node to the next via myelinated axons is known as saltatory conduction in neuroscience (from the Latin saltus, meaning "leap, jump").
What is the term for an increase in action potentials?As they descend the axon, action potentials "jump" from one node to the next. The term saltatory conduction, which means "to leap," describes this. Traveling in an axon with myelin is slower than travelling along an axon through saltatory conduction.
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in the riftia worm-endosymbiotic bacteria association, the bacteria are blank , using sulfide as an electron donor and oxygen as a terminal electron acceptor. multiple choice question. chemoautotrophic chemolithotrophic chemoheterotrophic
In the Riftia worm-endosymbiotic bacteria association, the bacteria are chemoautotrophic, using sulfide as an electron donor and oxygen as a terminal electron acceptor.
Chemoautotrophic refers to organisms that use chemical energy to convert carbon dioxide into organic compounds.
They do not need light to live, but rather derive their energy from the oxidation of inorganic chemicals or the conversion of inorganic carbon to organic carbon.
They are primary producers who produce food by photosynthesis, but they do it chemically rather than with the help of sunlight.
Therefore, in the Riftia worm-endosymbiotic bacteria association, the bacteria are chemoautotrophic, using sulfide as an electron donor and oxygen as a terminal electron acceptor.
Sulfide is used as the energy source and carbon dioxide as the carbon source. Bacteria's cells use oxygen to make ATP in the electron transport chain, which provides the energy they need to grow and reproduce.
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A species of plant requires a moderate amount of moisture and mild temperatures. Environmental conditions such as temperature and water availability affect the speed at which water-conducting cells differentiate. The same species is grown in two locations: a cool, wet area and a hot, dry area.
Which statement describes how the plants in the two locations are likely to compare?
OA. The plant in the cool, wet area is likely to be smaller than the plant in the hot, dry area.
OB. The plants in both areas are likely to stop growing and die.
OC. The plant in the cool, wet area is likely to be the same size as the plant in the hot, dry area.
OD. The plant in the cool, wet area is likely to be larger than the plant in the hot, dry area.
OD. The plant in the cool, wet area is likely to be larger than the plant in the hot, dry area since the species requires moderate moisture and mild temperatures. Water availability affects the speed at which water-conducting cells differentiate, which is critical for plant growth.
What environmental factors affect the speed at which water-conducting cells differentiate in plants?Environmental factors such as temperature, humidity, light, and soil moisture can affect the speed at which water-conducting cells differentiate in plants.
For instance, high temperatures and low humidity can lead to a higher rate of transpiration, which increases the demand for water uptake and can affect the development of water-conducting cells.
Why is water availability critical for plant growth?Water availability is critical for plant growth because it plays a vital role in various physiological processes such as photosynthesis, transpiration, and nutrient uptake.
Water is required for the transport of minerals and nutrients from the soil to the plant, and it also helps to regulate plant temperature by evaporative cooling through transpiration.
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Base your answers to questions 5 and 6 on
the pedigree chart below, which shows a history of ear lobe shape, and on your knowledge of biology.
Answer: C. ee
Explanation: Since the attached earlobe is a recessive trait, both the e's must be lowercase. Recessive traits must be in pairs to show. The dominant pairs can be represented by EE or Ee. Since the individual being shown is a female with the recessive trait, c is the correct answer.
Which element present in protein is used to form bridges that can link together the protein chains?
a) Nitrogen
b) Oxygen
c) Phosphorous
d) Sulfur
The element present in protein that is used to form bridges that can link together the protein chains is sulfur. Option d.
Proteins are large molecules that are made up of long chains of amino acids linked together. Proteins are important biological macromolecules that help in a wide range of cellular functions. Proteins can be used for energy, cellular signaling, structural support, immune defense, and many other functions in the body.There are 20 different types of amino acids that are used to make proteins.
These amino acids are linked together in a specific sequence to form a polypeptide chain. Polypeptide chains can then fold into complex shapes, and multiple polypeptide chains can combine to form a functional protein. The shape of a protein is critical to its function, and the shape is determined by the sequence of amino acids and how the polypeptide chain folds.
One important aspect of protein structure is the presence of sulfur-containing amino acids. These amino acids, such as cysteine and methionine, have sulfur atoms in their side chains. The sulfur atoms in cysteine can form disulfide bonds with other cysteine residues, creating bridges that link different parts of the protein together. These disulfide bonds are strong and can help to stabilize the protein structure.
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plants can sense which of the following environmental factors: i. gravity ii. pathogens iii. wind iv. light
Plants can sense all of the above-mentioned environmental factors: i. gravity, ii. pathogens, iii. wind, and iv. light. Plants have specialized cells and tissues called sensory cells that enable them to perceive and respond to changes in their environment.
For instance, plant roots have specialized cells called statocytes that can sense gravity and direct the growth of roots towards the direction of gravity. Similarly, plants can sense pathogens and initiate defense mechanisms, such as the production of defensive chemicals, in response to a pathogen attack. Plants can also sense wind and adjust their growth and structure accordingly to reduce wind damage. Finally, plants can sense light and use it for photosynthesis, which is essential for their survival.
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which is not part of the upper respiratory system?
The trachea, or windpipe, is part of the lower respiratory system, which also includes the bronchi, bronchioles, and lungs. Here option D is the correct answer.
The upper respiratory system includes the nose, pharynx, larynx, and associated structures, which are involved in the intake and conditioning of air before it reaches the lower respiratory system.
The upper respiratory system is responsible for the initial processing of inhaled air before it enters the lower respiratory system. It includes several structures, such as the nose, pharynx, larynx, and trachea, that work together to warm, humidify, and filter air as it moves into the lungs.
The upper respiratory system includes the nose, which filters, warms, and humidifies inhaled air, the pharynx, which is a muscular tube that connects the nose and mouth to the larynx, and the larynx, which contains the vocal cords and is involved in speech production. The bronchi are also part of the lower respiratory system, and they branch off from the trachea to deliver air to the lungs.
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Complete question:
Which of the following is NOT part of the upper respiratory system?
A. Nose
B. Pharynx
C. Larynx
D. Trachea
E. Bronchi
A person has a gene that determines the nail and patellar defect syndrome (D is a dominant trait), as well as the gene that determines the blood group according to the ABO system, are located on the same chromosome at a distance of 10 morganides. List all possible types of gametes in a person with IV blood group and heterozygous for the gene for the defect of nails and kneecap. Describe your response widely, please.
The rhesus D (RhD) antigen is what determines whether a person is RhD positive or RhD negative. It's a chemical that's present on the outside of red blood cells. RhD positive individuals are those who have the RhD antigen, while RhD negative individuals do not.
What blood type has dominant and recessive traits?The autosomal codominant inheritance pattern for the ABO blood type. The O allele is recessive, whereas the A and B alleles are codominant.
Even when combined with a Rh-negative gene, the Rh-positive gene prevails because it is dominant (stronger). The blood's Rh factor will be positive if a person possesses the + + gene combination.
The numerous blood types are created by various combinations of these three alleles.
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people who have color vision deficiency typically lack one or more of the three cones that are sensitive to a particular wavelength.T/F
The statement about people who have color vision deficiency typically lack one or more of the three cones that are sensitive to a particular wavelength is true (T).
What is color vision deficiency?Color vision deficiency is а condition in which аn individuаl is unаble to recognize specific colors correctly. It is аlso known аs color blindness. It hаppens when the color-sensing cones in the eyes fаil to work аppropriаtely or when their number is insufficient. Color vision deficiency cаn be cаused by genetic аnd non-genetic fаctors.
Whаt аre cones in the eye?The cone cells аre situаted in the retinа of the humаn eye. The cones help to distinguish the color of light we observe. They plаy аn essentiаl role in color vision, but they аre not equаlly sensitive to аll colors. In the humаn eye, there аre three types of cones: S-cones (sensitive to short wаvelengths), M-cones (sensitive to medium wаvelengths), аnd L-cones (sensitive to long wаvelengths).
The perception of vаrious colors аnd shаdes occurs due to the collаborаtion of these three types of cones in vаrious wаys. Therefore, it cаn be concluded thаt people who hаve color vision deficiency typicаlly lаck one or more of the three cones thаt аre sensitive to а pаrticulаr wаvelength.
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As it makes its way through the heart, blood passes through four chambers, four valves, two veins, two arteries, and the lungs. List the order in which the blood passes through these structures.
The superior and inferior vena cava are two large veins that supply blood to the right atrium. Blood can flow from the right atrium into the right ventricle thanks to the tricuspid valve.
What is the sequence of the valves that blood will pass through?The tricuspid valve (right AV valve), the pulmonary valve, the mitral valve, and then the aortic valve will all be accessed by blood (left semilunar valve).
What is the proper sequence for blood to travel from the heart to the lungs?Right atrium of the heart receives blood, which is then pumped to right ventricle, which then pumps blood to lungs. The oxygen-poor blood is subsequently transported from your heart to your lungs by the pulmonary artery. Your lungs saturate your blood with oxygen.
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on the big island of hawaii, songbirds are limited to higher elevations. what is a potential biotic explanation for why?
At first, visitors to the Hawaiian Islands brought rats and pigs. Subsequent settlers brought a larger variety of animals, including goats, sheep, pigs, deer, and cattle, which later overpopulated the islands.
The native food webs were hampered by ants and other arthropods that were introduced. Adult birds as well as their eggs and young were eaten by rats and cats.
The watersheds were transformed by numerous alien plants, which also eliminated the original plant ecosystems. The majority of native Hawaiian songbirds are now restricted to higher altitudes as a result of mosquito-borne diseases like malaria and pox, to which the majority of Hawaiian passerines, or songbirds, were not immune.
The Akikiki, a dwindling Hawaiian bird, is further stressed by changed rainfall patterns and the spread of avian diseases brought on by global warming.
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What kind of inhibitor would you predict itaconate to be?
irreversible
noncompetitive
competitive
It is predicted that itaconate would be a competitive inhibitor. Itaconate, a compound that modulates inflammation and metabolism, has been found to inhibit the activity of succinate dehydrogenase, an enzyme involved in the Krebs cycle.
Its inhibitory action on the enzyme is predicted to be competitive in nature. Competitive inhibitors bind to the active site of an enzyme, competing with the substrate for binding.
Thus, it is expected that itaconate binds to the active site of succinate dehydrogenase, blocking the substrate from binding and preventing the enzyme from carrying out its normal function.
This inhibition can be overcome by increasing the concentration of the substrate, which would displace the inhibitor from the active site.
Therefore, itaconate is predicted to act as a competitive inhibitor of succinate dehydrogenase.
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if the small bumps seen when half of the membrane is peeled away were chemically shown to consist of the lipid cholesterol, how would the fluid mosaic model have to be modified?
The fluid mosaic model would have to be modified to account for the presence of cholesterol in the membrane, as previously it was assumed that only phospholipids, proteins, and polysaccharides were found in the membrane.
What are phospholipids?Phospholipids are a type of lipid (a class of molecules that includes fats, waxes, and sterols) that are an important component of cellular membranes. They are composed of two parts: a hydrophilic head group and a hydrophobic tail group. The head group is made up of a phosphate group and a hydrophilic group such as choline, ethanolamine, serine, or inositol. The hydrophobic tail group is made up of two long-chain fatty acids. These hydrophilic and hydrophobic ends allow phospholipids to spontaneously form into membrane bilayers, which are an important structure in biological cells.
What are polysaccharides?Polysaccharides are complex carbohydrates made up of hundreds or thousands of interconnected monosaccharide (simple sugar) molecules. They are used as energy storage by plants, fungi and bacteria and serve many other important functions in the body, such as providing structure and acting as hormones. They can also be used as dietary fibers to maintain gut health, and are important in the food industry as thickening, gelling and emulsifying agents.
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how could a specially formulated sports drink potentially support the body's needs better?
Answer:
Sports drinks are advertised to replenish glucose, fluids, and electrolytes (sodium, potassium, magnesium, calcium) lost during strenuous exercise as well as to enhance endurance.
Explanation:
the area on the retina that influences the firing rate of the neuron is called the a. inverted fovea. b. amacrine region. c. receptive field. d. divergence area.
The receptive field is the area on the retina that influences the firing rate of a neuron. It is made up of light-sensitive cells and is located within the central fovea. The receptive field is composed of two distinct parts: the center and the surround.
The center is the area of the retina where light-sensitive cells are most densely packed, and it is responsible for detecting small changes in light intensity. The surround is the area outside of the center, and it is responsible for detecting larger changes in light intensity.
The receptive field also contains neurons that receive signals from neighboring areas of the retina, allowing it to detect changes in light intensity that extend beyond its immediate area. The receptive field is essential for the processing of visual information, as it allows the neuron to respond to a wide range of light intensities.
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tuberculosis results from an infection by the bacterium.T/F
The given statement "tuberculosis results from an infection by the bacterium" is true because bacterium primarily affects the lungs but can also infect other parts of the body, such as the kidneys, spine, and brain.
TB is spread through the air when a person with an active TB infection in their lungs coughs, sneezes, or talks, and releases tiny droplets containing the bacteria into the air. Another person can become infected by inhaling these droplets into their lungs.
Once the bacteria enter the body, they can take two different paths. In most cases, the body's isimmune system able to contain the bacteria and prevent them from causing disease. This is called latent TB infection, and the person does not have any symptoms and cannot spread the infection to others.
TB is a contagious disease that spreads through the air when an infected person coughs, sneezes, or talks. TB can be a serious and life-threatening disease if left untreated, but it can usually be cured with proper treatment using antibiotics.
Therefore, the given statement is true.
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HELP!!! I need help on this.
Answer: D. Children who drank the water are likely to become violent within a year or two.
What is population?Population is a term used to refer to the total number of people living in a particular area. It is usually measured by counting the number of people within a given area, either through census or other surveys. Population density is the number of people per unit area, usually expressed as the number of people per square kilometer. Population growth is the change in population size over time, typically measured as a percentage. Population dynamics is the study of how populations change over time, including factors such as birth and death rates, migration, and other factors.
The graph indicates that as the average lead level in the water supply increases, the rate of violent crime in the local population also increases. This suggests that the Flint water supply could be contributing to an increase in violent crime in the area, and that the effect could be seen within a year or two of exposure. Therefore, the most accurate answer is D. Children who drank the water are likely to become violent within a year or two.
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which action would help a person conserve water?
Answer:
C. Running the washing machine only when it is full
Explanation:
C is the answer because washing in bulk conserves water while washing in bits does not conserve water
For instance, if you decide to wash your clothes everyday, it will waste water but if you wash your clothes once or twice in a week, it conserves water
A is not the answer because, the action will just waste electricity
B is also not the answer because, taking baths instead of quick showers waste water and does not conserve it
D is not the answer because turning off fans when leaving the house conserves electricity not water
Rotator cuff muscles connect the scapula to the greater and lesser tubercles of the___________.humerusradiusscapulaulna
Rotator cuff muscles connect the scapula to the greater and lesser tubercles of the humerus.
The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint. These muscles work together to stabilize the shoulder joint and allow for a wide range of movements, such as lifting, reaching, and throwing. The four rotator cuff muscles are the supraspinatus, infraspinatus, teres minor, and subscapularis. The supraspinatus muscle attaches the top of the scapula to the greater tubercle of the humerus. The infraspinatus and teres minor muscles attach the bottom of the scapula to the greater tubercle of the humerus, while the subscapularis muscle attaches the front of the scapula to the lesser tubercle of the humerus. Together, these muscles provide strength and stability to the shoulder joint.
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Pick one of the following misconceptions from the list below.
Write a 3 to 5 sentence statement to correct it.
Explain the error in the misconception and provide evidence, examples, or facts to support the correct answer.
If your explanation does not include specific details/facts and is constructed with vague statements, you will not receive points.
Use the information from the lessons to find supporting details.
Misconceptions- Pick ONE
weather and climate are the same thing
cold or unusually cool weather is proof that global warming is not really happening
human activity cannot change climate because the atmosphere and Earth itself are so big
The burning of fossil fuels, logging of forests, and raising of livestock all have a rising impact on the climate and temperature of the planet. This increases the greenhouse effect it causes global warming atmosphere.
Does the definition of climate and weather overlap?When you go outside on every given day, you encounter the weather. In those other words, it refers to the short-term atmosphere at a certain region. The average of a place's weather patterns over a longer time frame, typically 30 years or more, is called the climate.
How does anthropogenic climate change get destroyed?The amount of greenhouse gases, aerosols (small particles), or cloudiness in the Earth's atmosphere change as a result of human activities, which also contribute to climate change. Burning fossil fuels, which emits carbon dioxide gas into the atmosphere, is the largest known contributor.
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Which is the proper order of structures that contact the substances removed from the blood? a. nephron → urethra → bladder → ureter b. urethra → ureter → bladder → nephron c. nephron → ureter → bladder → urethrad. urethra → bladder → ureter → nephron
The proper order of structures that contact the substances removed from the blood - Nephron -> Ureter -> Bladder -> Urethra. Therefore the correct option is option C.
The nephron is the kidney's functional element, where wastes and extra fluid are eliminated from the circulation through filtration, reabsorption, and secretion. A muscular conduit called the ureter carries urine from the kidney to the bladder.
A muscular sac called the bladder holds pee until the urethra allows the body to expel it. Last but not least, the urethra is a tube that carries urine from the bladder to the outside world. The urine is correctly filtered and collected in the bladder before being expelled from the body thanks to this pathway.
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What statement is true of eukaryotic chromosomes? a. There are two sets of chromosomes in haploid cells. b. They occur in pairs in haploid cells.
Neither statement is true. In eukaryotic cells, chromosomes occur in pairs in diploid cells (i.e., cells with two sets of chromosomes), and in single sets in haploid cells (i.e., cells with one set of chromosomes).
Eukaryotic cells are defined by the presence of a nucleus, which contains the cell's genetic material in the form of chromosomes. Chromosomes are made up of long strands of DNA that are tightly coiled and packaged with proteins called histones. Eukaryotic organisms can have either a haploid or diploid chromosome number. Haploid cells have only one set of chromosomes, which means they have half the number of chromosomes as diploid cells. Therefore, statement b is not true.However, statement a is also not true because haploid cells have only one set of chromosomes, not two sets. It is diploid cells that have two sets of chromosomes.
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which structures increase the absorptive area of proximal convoluted tubule cells? a) microvilli b) flagella c) cilia d) rugae. b) distal convoluted tubule.
The structures that increase the absorptive area of proximal convoluted tubule cells are A) microvilli.
The kidney nephrons contain the highly convoluted and coiled proximal convoluted tubule (PCT). Most of the beneficial solutes and water in the filtrate that passes through the glomerulus are reabsorbable by the PCT.
Microvilli, which resemble little fingers and significantly increase a cell's surface area, are present on the PCT cells' surface. The solutes and water from the filtrate can be reabsorb more effectively thanks to the expanded surface area. The PCT cells also include a significant number of mitochondria, which provide the energy necessary for the active transport of solutes.
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Sycamore seeds need to travel as far from the tree as possible. Write down two reasons why.
Answer:
Explanation Sycamore seeds have a “wing.” When they fall from a tree, they spin in circles. This helps them stay in the air longer than if they fell straight down. A breeze or wind can blow the seeds. They will land far from the parent tree.:
Which scientist discovered how the bases of DNA?
The scientist who discovered how the bases of DNA are arranged and paired with each other is James Watson and Francis Crick. It is known as the Watson-Crick model or double helix model of DNA
Deoxyribonucleic acid (DNA) is a molecule that holds the genetic instructions used in the development and function of all known living organisms and many viruses. The DNA molecule contains two chains, twisted together to form a double helix, which is made up of four chemical bases: adenine, thymine, cytosine, and guanine. Watson and Crick made use of a wide variety of experimental data, including X-ray crystallography images of DNA fibers taken by Rosalind Franklin and Maurice Wilkins, to determine the structure of DNA. Their observations led them to propose the double helix structure of DNA, which they published in 1953.
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when boys are in puberty, they typically do not know that they have begun to produce sperm until they experience a. andropause. b. spermarche. c. menarche. d. semenarche
Answer:
B. Spermarche
Explanation:
Spermarche is known as semenarche-is the beginning of development of sperm in boys' testicles at puberty. It is the counterpart of menarche in girls. Depending on their upbringing, cultural differences, and prior sexual knowledge, boys may have different reactions to spermarche, ranging from fear to excitement. Spermarche is one of the first events in the life of a male leading to sexual maturity. It occurs at the time when the secondary sex characteristics are just beginning to develop.