Question

Which is an example of evolution by genetic drift, and NOT by natural selection?

A) A small population of bark beetles is carried in driftwood to a new island, where the members reproduce rapidly.
B) A population of lizards develops longer tongues when their food source changes.
C) The bright red feathers of a male cardinal helps it attract a female mate.
D) A female frog lays hundreds of eggs in a clutch, but only a few of the eggs hatch and develop into adult frogs.

Answer 1

Answer: A) A small population of bark beetles is carried in driftwood to a new island, where the members reproduce rapidly.

Step-by-step explanation:

Both the natural selection and genetic drift are responsible for evolution. The key difference between the natural selection and genetic drift is the change in allelic frequency by chance, but in natural selection the allelic frequency change by differential reproductive success.

A) Here, the allelic frequency will change by chance due to shifting of beetles to new island. The members have equal advantage of survival.