Question

How does natural

selection change allele
frequencies in
populations?
A. Natural selection controls the
rate of mutations.
B. Natural selection selects alleles
that improve fitness.
C. Natural selection has no control
over allele frequency changes.

Answer 1

Answer: B. Natural selection selects alleles that improve fitness.

Explanation: If certain alleles give an organism traits that make it more well-suited to the environment, then the allele frequency of those genes will increase. It will increase because an organism that is more well-suited to its environment will be able to pass its genes to the next generation.