A test-cross should result in 50% of all children having the bb genotype and a white phenotype if the male is Bb as previously described. After a testcross to a heterozygous person, there should always be an about 1:1 ratio between the dominant and recessive characteristics. Therefore, the genotypic to phenotypic ratio in this instance is 50:50.
The parts of an organism's genome that make up its genotype. The set of alleles or genetic variations that a person possesses inside a certain gene or genetic area is also referred to as their genotype. The number of copies of each chromosome found in that species, or ploidy, determines how many alleles a person can have for a given gene. Each person has two alleles for each gene since humans are diploid (have two full sets of chromosomes). Homozygous is the term used to describe a genotype where both alleles are the same. The genotype is referred to as heterozygous when there are two distinct alleles.
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A similar screening test was developed and evaluated on a similar population, and found to have a sensitivity of 38%, a specificity of 97%, with 63% positive predictive value and 91% negative predictive value. Pick the correct interpretations of these results: (Pick all answers that are true - you will get partial credit for whatever you get correct)
Students who do not genuinely have anorexia are more likely to be ruled out by this screening test than those who do.
The screening test indicates that anorexic children have a 38% chance of testing positive while anorexic students have a 97% chance of testing negative.
Those who test positive for disease have a 63% likelihood of having it, whereas those who test negative have a 91% chance of being disease-free. An unjustified fear of being overweight and a skewed body image are characteristics of anorexia.
Attempts to keep a weight below average by fasting or excessive activity are symptoms. To get back to normal weight, medical intervention could be required.
College students face a lot of pressure to be social and presentable because they are frequently in the company of people their own age. Numerous children decide when, what, and how much to eat for the first time. The two most typical eating disorders are bulimia and anorexia. Usually, eating disorders start between the ages of 18 and 21. In college, between 10 and 20% of women and 4 to 10% of males struggle with eating disorders, and the prevalence is rising.
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What is the origin information of new species called
A. Evolution
B.Biological species
C. Natural selection
D.Specitation
I think its A but im not sure
Explanation:
. Thus, new species form when individuals from diverging populations no longer recognize one another as potential mates, or opportunities for mating become limited by differences in habitat use or reproductive schedules
How can there be 46 chromosomes in a human cell at metaphase and also 46 chromosomes in each daughter cell?
The daughter cells share the same genetic makeup as the parent cells. Somatic cells divide and then separate all 46 chromosomes through the process of mitosis. The end product is two daughter cells with 46 chromosomes.
A chromosome is a lengthy DNA molecule that contains all or a portion of an organism's genetic code. The very long, thin DNA fibers in most chromosomes are covered with packing proteins; in eukaryotic cells, the histones are the most significant of these proteins. In order to preserve the integrity of the DNA molecule, these proteins condense and adhere to it with the help of chaperone proteins. These chromosomes exhibit a complicated three-dimensional structure that is crucial for controlling transcription.
A phase of cell division known as "metaphase" (mitosis or meiosis). Individual chromosomes are typically dispersed throughout the cell nucleus.
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What is the percentage of having tall pea plants in the offspring?
The percentage of having tall pea plants in the offspring is about 75%
A person who has two copies of the allele that codes for the dominant characteristic is said to be homozygous-dominant for that trait. This allele, which is sometimes referred to as the "dominant allele," is typically denoted by the uppercase version of the letter used for the associated recessive characteristic (such as "P" for the dominant allele producing purple flowers in pea plants). An organism's genotype is symbolized by a doubling of the trait's symbol, such as "PP," when it is homozygously dominant for that trait.
Refers to a trait that can only be seen in homozygous individuals; it is a trait that is often hidden by other inherited qualities but persists in populations of heterozygous individuals.
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Describe in detail the process of Evolution.
Answer:Evolution is a process that results in changes in the genetic material of a population over time. Evolution reflects the adaptations of organisms to their changing environments and can result in altered genes, novel traits, and new species. ... An example of macroevolution is the evolution of a new species.
Explanation:May i have bonus?
Can someone help me with this? I've asked my teachers and I'm still lost lol
Answer:
so well go to the guide and check the q. Then either create an doc or slide when done click file then download then pdf. k. then click add file then add the pdf file.
Explanation:
Answer fully pls!!!!!!!!!!!
Answer: 503
Explanation:
1. Solve the 10 power of 2, which equals to 100. (Not 20 because this is a power which means it’s the number in this case 10 then you have to multiply that number by the power so 10*10=100)
2. Then 5*100= 500
3. Finally 500+3=503
What do clams need to survive?
Clams need aquarium pH: 7.0 – 8.0 and water temperature: 70 – 80 degrees Fahrenheit to survive.
With aquarium pH, some potterers suggest that lower terrarium pH in the upper 6’s may also be respectable to Freshwater Bones. Others try to keep terrarium pH above 7. Water on the acidic side may not be stylish for the bone ’s shell over the long term. Water of the aquarium should be well oxygenated.
Calms care issue relates to terrarium size and the quantum of water it holds. There needs to be enough water in the tank to hold sufficient comestible matter to support the calm ’s nutritive requirements.
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Help! Pls due right nowwww
Answer:
Answers are in the image
How does the human brain receive messages and send signals to the body about what's happening?
Answer:
heres how
Explanation:
Neurons communicate with each other by sending chemical and electrical signals. Each neuron is connected with other neurons across tiny junctions called “synapses.” Impulses rush along tiny fibers, like electrical wires, from one neuron to the next. Electrical impulses travel through neurons.
In the investigation where we combined the bath bomb with water, we saw bubbles forming but we did not see an increase in the overall
mass. This happened because....
a - In a closed system, no matter can get in or out so the mass stays the same.
b - In an open system, no matter can get in or out so the mass stays the same.
c - All matter is made of small particles that are too small to be seen.
d - Matter has mass and takes up space. (not this one)
Answer:
C all matter is made of small particles thatcare too small to be seen
Answer:
C
Explanation:
the guy above me said so
What conclusions can be drawn cross I and cross II? explain how the data support your conclusions for each other
Cross I and Cross II obey the law of dominance and the law of segregation, respectively, according to the mendelian pattern of inheritance.
The F1 has only shown a single dominant trait when mating with two pure breeding Geno types. By selfing two F1 parents, it was also discovered that the mono hybrid F2 ratio of 3:1 is followed by the progeny population.
The phenotype ratio of the dihybrid test cross is 1:1:1:1 or
The dihybrid test cross ratio's observed and predicted results do not significantly differ from one another.
Number of phenotypes Equals degrees of freedom -1= 4-1= 3
Critical Chi square value with 3 degrees of freedom and 5% level of the table significance is 7.82.
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Note: The missing table in the diagram is given bellow,
Which location would energy be transferred more quickly between the atmosphere and Earth's surface, a lake where the air is 5*C or an ice sheet where the air is 5*C
What are the genotypes of the F2 generation?
Answer:
The genotypes of the F2 generation depend on the genotypes of the parents in the F1 generation.
Explanation:
If the F1 generation is produced by crossing two individuals with different genotypes, the F2 generation will have a variety of genotypes.
For example, if the F1 generation is produced by crossing a homozygous dominant individual (AA) with a homozygous recessive individual (aa), the F2 generation will have a 1:2:1 ratio of genotypes: one quarter will be homozygous dominant (AA), half will be heterozygous (Aa), and one quarter will be homozygous recessive (aa).
If the F1 generation is produced by crossing two heterozygous individuals (Aa and Aa), the F2 generation will have a 3:1 ratio of genotypes: three quarters will be heterozygous (Aa) and one quarter will be homozygous recessive (aa).
It is also possible for the F1 generation to be produced by crossing two individuals with more complex genotypes, in which case the F2 generation will have a variety of genotypes based on the combination of the parents' genotypes.
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Which of the following is a biotic factor that can affect the population size of a species? Birth rate Sunlight Water Land
Answer: Birth Rate
Explanation: I got it on the test
Eventually, do you think you will the population of the black will decrease and the white increase?
A. Yes
B. No
Answer:
B. No
Explanation:
Projections show that whites will decline; the number of old people will increase; and racial minorities, mainly Hispanics, will grow the most, making them the main engine of demographic change in the U.S. for the next 10 years and beyond.
Today, there are over 74.1 million people under age 18 in the U.S. country. There are 56.4 million people age 65 and older.
Ten years from now, there will almost be as many old folks as there are young ones. The numbers of young people will have grown just a little to 76.3 million, but the numbers of old people will have increased a lot – to 74.1 million. A lot of these new elderly will be baby boomers.
heyy! i’ll give brainliest help asap pls
Answer:
im going to say C is the best choice
Explanation:
According to the March, 1998 Executive Summary from the Office of the Chief Scientist at NOAA, what are the Earth's last unexplored frontiers?
Option c is Correct. The oceans are the final uncharted territory on earth, according to the executive summary from the office of the chief scientist at NOAA from March 1998.
Nearly the whole surface of our planet has been explored by humans. Each desert has been traversed by humans. We have traversed almost every peak, as well as the skies and even the universe beyond.
We still haven't made much progress in exploring our waters despite all of this. Over 80% of the oceans on Earth have not yet been fully mapped out. This is caused in part by the size of the oceans on Earth, but primarily by the intense pressure and darkness you experience when trying to explore the ocean's depths.
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Correct Question:
According to the march 1998 executive summary fron the office of the chief scientist at NOAA what are the earths last unexplored frontiers?
A) atmospheric layers
B) mountains
C) oceans
D) deserts
how do the locations where photosynthesis occurs differ in prokaryotes and eukaryotes
Photosynthesis takes place on the folds in prokaryotes and in specialised organelles in eukaryotes. Prokaryotic cells don't have specific organelles or a remote nucleus.
What is photosynthesis?
Plants absorb water (H2O) and carbon dioxide (CO2) from the soil and atmosphere during photosynthesis. Water is oxidised, which means it loses electrons, while carbon dioxide is reduced, which means it receives electrons, inside the plant cell. Water is converted into oxygen and carbon dioxide into glucose as a result. After storing energy within the glucose molecules, the plant releases the oxygen back into the atmosphere.
Chloroplasts, which are tiny organelles found inside plant cells, are there to store solar energy. Chlorophyll, a light-absorbing pigment found in the thylakoid membranes of the chloroplast, is what gives plants their green hue.
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Why is RNA necessary for protein synthesis?
Answer:
Ribosomal RNA (rRNA) associates with a set of proteins to form ribosomes. These complex structures, which physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. They also bind tRNAs and various accessory molecules necessary for protein synthesis.
Explanation:
A biologist used the radioisotope tritium (3H) to label thymine and the radioisotope carbon-14 (14C) to label uracil. She then incubated a growing bacterial culture with both labeled bases. After five hours of incubation, the biologist extracted polynucleotides from the cells and separated them into three groups, each containing a range of different polynucleotide lengths. The first group contained the shortest polynucleotides. The second group contained polynucleotides of midrange length, and the third group contained the longest polynucleotides. Then she determined the percentage of each radiolabel in each fraction. Her data are summarized in the table above. Which statement represents a reasonable hypothesis that could explain these results?Uptake of 3H label resulted from DNA replication, and uptake of 14C label resulted from transcription.
The statement that represents a reasonable hypothesis that could explain these results is Uptake of 3H label resulted from DNA replication, and uptake of 14C label resulted from transcription.
The process by which a double-stranded DNA molecule is duplicated to form two identical DNA molecules is known as DNA replication. Replication is necessary because when a cell splits, the two new daughter cells must have the same genetic information, or DNA, as the parent cell.
The process of transcribing a piece of DNA into RNA is known as transcription. Messenger RNA is created when segments of DNA are translated into RNA molecules that can encode proteins. Other DNA sequences are transcribed into RNA molecules known as non-coding RNAs. Only 1-3% of total RNA samples contain mRNA.
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Which part of the brain is represented by the highlighted area shown below? (5 points)
0 Cerebrum
Cerebellum
ОООО
O Medulla oblongata
Pons
Answer: Cerebellum
Explanation: I took the test
What is the first and the most important step in the resuscitation of this newborn?
The single most crucial and efficient phase in cardiopulmonary resuscitation of a critically ill newborn is lung ventilation. The newborn should be placed under a radiant heat source to offer warmth. The baby should then be dried off, their airway should be cleared with a bulb syringe or suction catheter if necessary, and their breathing should be stimulated.
Rescuers should make sure that aided ventilation is being administered as optimally as possible before beginning chest compressions because ventilation is the most effective intervention in neonatal resuscitation and because chest compressions are likely to compete with good ventilation. Thus successful resuscitation depends on efficient ventilation. One cannot always foresee or forecast the necessity for neonatal resuscitation at birth.
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Which molecules contain Thymine?
a.DNA molecules
b.RNA molecules
c.Both DNA and RNA molecules
d.Neither DNA and RNA molecules
Answer:
A. DNA molecules
Explanation:
DNA molecules contain the nitrogenous bases of adenine, thymine, guanine, and cytosine.
RNA molecules have the same bases, except they do not have thymine.
In RNA, thymine is replaced with uracil.
So, since only DNA has thymine, the correct answer is A. DNA molecules
17. Many scientists have argued that this point in human history marks the onset of Earth's sixth mass extinction event. What is the suspected cause of this
current mass extinction?
A. Volcanoes
O B. Asteroids
O C. Ice ages
D. Humans
Answer:
D.Humans
Explanation:
humans contribute to global warming
which is causing rising sea levels and climate change but we are all gonna die as soon as the sun reaches it's final stage but I don't want to scare you off this gonna happen in many many many many many years to come
(b) How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?
Answer:
The low power objective lens is manipulated by turning the focusing knob on the microscope. This moves the lens up and down to focus the specimen. The microscope should be set on the low power objective lens and the image should be brought into focus by turning the focusing knob. Once the image is in focus, the higher power objective lenses can be used to further magnify the specimen.
G. Color blindness is a x-linked genetic disorder. If a woman, who is a carrier for color blindness, marries a normal man, then what is the percent possibility that their sons will be colorblind
If the mother is carrier color blind and the father is normal, the percent possibility that their sons will be colorblind is 25%.
Color blindness is an inherited/genetic disorder that is passed from parents to their children, this disorder is often also called sex-linked because this disorder is carried by the X chromosome. This means that the Y chromosome does not carry the color blindness factor. The genotype of color-blind i.e.:
[tex]X^BX^B[/tex] → Normal[tex]X^BX^b[/tex] → female carrier [tex]X^bX^b[/tex] → color blind woman[tex]X^BY[/tex] → normal male[tex]X^bY[/tex] → male color blindIf the mother is carrier color blind ([tex]X^BX^b[/tex]) and the father is normal ([tex]X^BY[/tex]), then the offspring are:
Parents: [tex]X^BX^b[/tex] >< [tex]X^BY[/tex]
Gametes: [tex]X^B,X^b[/tex] >< [tex]X^B,Y[/tex]
Filial:
[tex]X^BX^B[/tex] (normal)
[tex]X^BX^b[/tex] (girl carrier)
[tex]X^BY[/tex] (normal sons)
[tex]X^bY[/tex] (sons color blind)
So, their sons will be colorblind in 1/4 or 25%.
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Type of cell
Xylem
1.Absorption of mineral ions
2.Transport of oxygen
3.Movement of mucus
4.Protection against pathogens
5.Structural support
Answer:
xylem is for the transport of oxygen in a plant
I know this because it was in my syllabus last year
Answer:
hey dude here is your answer
Which of the following statements about human impact on trees is true?
a.Human activity always has a negative impact on trees.
b.All human uses of trees require destruction of the trees.
c.Human activity has had both a positive and negative impact on trees.
d.Cutting down trees is the only activity that has a negative impact on trees.
Answer:
c. Human activity has had both a positive and negative impact on trees.
Human activity can have negative impacts on trees, such as deforestation and clearcutting, but it can also have positive impacts, such as tree planting and reforestation efforts. It is not true that all human uses of trees require destruction of the trees, as humans also use trees for a variety of non-destructive purposes such as recreation, wildlife habitat, carbon sequestration, and aesthetic value. And cutting down trees is not the only activity that has a negative impact on trees, other human activities such as air pollution, soil degradation, water pollution can also have negative impacts on trees.
Which of the following statements is CORRECT concerning the concept of sex and dreams? a. Men and women typically dream about similar things. b. Men dream more each night than women. c. Research reports that men and women differ in the things they dream about. d. Women tend to dream twice as much as men.
Answer: D I believe
Explanation: