Question

In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in surviving organisms, and evolutionary biologists have been studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occured in the rodent populations following the accident?

a.) Mutations caused major changes in rodent physiology over time.

b.) Mutation caused genetic drift and decreased fitness.

c.) Mutation caused the fixation of new alleles.

d.) Mutation led to increased genetic variation.

Answer 1

Mutation is the sudden change in the DNA.

Mutations arise due to any kind of mutagen or radiation.

In this disaster mutations were introduced due to the radiations.

So, there will be variations in the organism.

Mutations will not cause changes only in the physiology of an organism.

It does not cause genetic drift and decreased fitness.

New alleles cannot be fixed by mutations.

But mutations can definitely increase the variety of organisms.

So, the correct answer is d.