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Alla [95]
3 years ago
15

How do variation and natural selection work together to help cause evolution?

Biology
1 answer:
Liono4ka [1.6K]3 years ago
3 0
During natural selection animals (example) choose the traits they best like to continue breeding with. Variation helps this by providing both good and okay (bad) things too choose from. 

Once natural selection has occurred, the population has a whole will evolve by leaving behind the undesired traits. 
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A mating between an individual homozygous dominant for both traits (AB/AB) and one homozygous recessive for both traits (ab/ab) is conducted.

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The F1 progeny is then test-crossed to a homozygous recessive individual:

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Since 30% of all the gametes produced by the F1 individual will be recombinant, 70% will be parental. As there are two types of parental gametes, each of them will have a frequency of 35%.

<u>The offspring that will have a dominant phenotype for both traits has the genotype AB/ab with a proportion of 35%.</u>

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