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Bumek [7]
2 years ago
6

What must be true for natural selection to happen?

Biology
1 answer:
Tems11 [23]2 years ago
8 0

Answer:

D

Explanation:

Because there has to be competition or one population wouldnt decrease and the other wouldn't increase due to survival and reproduction the population doesn't always have to be below the carrying capacity because it can also do it when its above and natural selection can act on traits determined by different alleles.

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The following F2 phenotypic data was obtained from a Drosophila testcross using an F1 offspring. Assume red eye and brown body a
dmitriy555 [2]

Answer:

The genotype of the F1 was wy+/w+y.

Explanation:

One of the given options has a typo: the red eye-brown body offspring count should be 56 instead of 561.

<u>We have two genes with two alleles each:</u>

Red eyes (w+) is dominant over white eyes (w).

Brown body (y+) is dominant over yellow body (y).

The phenotypes of the F2 tesulting from a test cross (F1 x wy/wy) are:

  • wy+/ey (white-eye, brown body): 670
  • w+y/wy (red-eye, yellow body): 650
  • wy/wy (white-eye, yellow body): 38
  • w+y+/wy (red-eye, brown body 56

If the genes w and y are linked, two phenotypes in the F2 will be much more abundant than the other two. Recombination during meiosis is a rare event, so the most abundant phenotypes are the parentals (the ones present in the F1 parent).

Every individual in the offpsring has a <em>wy</em> chromosome, as this was the gamete inherited from the test cross individual.

In this case, the most abundant gametes are wy+ and w+y, so the genotype of the F1 was wy+/w+y.

Notice how when recombination occurs in the F1 parent, the recombinant gametes appear: wy and w+y+, which are the less abundant in the F2 progeny.

8 0
3 years ago
Which statement best describes cancer cells?. . A. They grow as a single layer of cells.. B. They cease to reproduce after 20–50
adell [148]

Answer: The statement that best describes cancer cells is option D.

5 0
3 years ago
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The retina is a photosensitive tissue that contains the special photoreceptor cells. What is the purpose of these photoreceptor
Luba_88 [7]
A. to convert light to electrical impulses!!!! I hope this helps!!! :)
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3 years ago
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All the things in an experiment that must be the same to make it fair are called
ch4aika [34]
Controlled Variable.
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3 years ago
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How could wetland restoration affect humans who live in the area? How might it affect native wildlife? (Consider both positive a
harkovskaia [24]

Answer:

Loub

Explanation:

8 0
2 years ago
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