3.5 Biology - Allele Frequencies

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Last updated 12:50 AM on 8/3/26
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4 Terms

1
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What happens to beneficial alleles under natural selection?

They increase in frequency over generations.

2
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What happens to disadvantageous alleles?

They usually decrease in frequency because carriers leave fewer offspring.

3
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Does natural selection act on genes or phenotypes?

It acts on phenotypes, but changes allele frequencies.

4
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Why doesn't natural selection create perfect organisms?

It only acts on existing variation and environments constantly change.