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Tanya [424]
3 years ago
5

Which options describe Darwin's theory of natural selection? Select all that apply. Natural selection results in descent with mo

dification. Evolution occurs because of natural selection. Natural selection occurs because of evolution. Natural selection results in populations staying the same over time.
Biology
1 answer:
Gwar [14]3 years ago
4 0

Answer:

Natural selection occurs because of evolution

Natural selection results in descent with modification

Natural selection occurs because of evolution.

Explanation:

i think those are the 3

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there are 20 amino acids

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Differentiate between a spider's web and a bird's nest.​
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one is made of silk and one is made from branches and anything to keep it together and for padding

Explanation:

the spider makes the webs out of silk and it traps anything that goes through it. the birds make the nests from branches and litter.

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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:

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  • wy/wy (white-eye, yellow body): 38
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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
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the diamter of the tree is based off of the age as we can see that it gets bigger the older the tree is

7 0
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Hnrndkc HD end djd HD did djdjd did did didndidjdi

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