Question

Which of the following scenarios will decrease the genetic variation of a population?(1 point)
Responses

a population of birds suddenly decrease their frequency of sexual reproduction
a population of birds suddenly decrease their frequency of sexual reproduction

an individual works out, increasing their muscle mass
an individual works out, increasing their muscle mass

a mutation alters the sequence of a gene resulting in a new allele
a mutation alters the sequence of a gene resulting in a new allele

a mutation in a chromosome makes it more likely to undergo genetic recombination

Answer 1

"a population of birds suddenly decrease their frequency of sexual reproduction"

Explanation: Sexual reproduction and recombination create and shuffle alleles, maintaining or increasing genetic variation. Reducing sexual reproduction lowers recombination and the generation of new allele combinations, thus decreasing genetic variation. The other choices either add new alleles (mutation) or are non‑heritable (exercise).