In a population of beetles, there are green and brown colorations that occur with equal frequency. after a forest fire, only 20 beetles remain. 18 of them are green and 2 of them are brown. what describes this change in frequencies?
a) founder effect provided a new distribution of phenotype frequencies
b) gene flow occurred, as the 20 beetles migrated from a distant location.
c) a population bottleneck occurred, altering the resulting allele frequencies.
d) natural selection selected for phenotypes that blended with green leaves, which did not burn.

C. a population bottleneck occurred, altering the resulting allele frequencies

Explanation:

A population bottleneck occurred, altering the resulting allele frequencies. Since a catastrophic fire affected the original population, many of the beetles were killed off. The resulting population that is left to reproduce has a different allele frequency. This is known as the bottleneck effect, and is a type of genetic drift. Allele frequency and phenotype frequency changes are random and are not due to selective pressures.

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