Question

After which event could you say with most certainty that evolution has occurred? (Points : 3) One animal grows abnormally large. An allele frequency changes in a population. A new predator comes into an environment. A white-eyed fly is born into a population of brown-eyed flies.

Answer 1

An allele frequency is a factor of evolution.

Answer 2

"An allele frequency changes in a population" would be the best option. The other options are one-off incidents that can be explained by simple mutations alone, not necessarily evolution.