Question

Which event is an example of genetic drift? An earthquake kills 90 percent of the green beetles in a population of green, black, and brown beetles. A green beetle travels from its population into a new population of entirely black and brown beetles. Green beetles have better camouflage than brown or black beetles and are not eaten as often. Warm temperatures cause green, black, and brown beetles to start reproducing earlier than normal.

Answer 1

The answer is C. Genetic drift is the change of an allelic frequency due to random sampling in a population. When the brown and black bottles are preyed upon compared to the green bettles, their numbers in a population decrease. Therefore the next generations/offsprings of bettles population is more likely to be of green beetles since they will be more in the parent population. The allelic frequency of the allele for green bettles becomes higher than that of brown and black beetles. Eventually, after generations, the black and brown beetles may be eliminated from the population

Answer 2

The correct answer would be "An earthquake kills 90 percent of the green beetles in a population of green, black, and brown beetles".

Genetic drift is one of the natural phenomenons which caused evolution.

It changes the frequency of an allele in a population.

The effect of genetic drift is maximum in small populations or when population size gets reduced to very small due to factors such as overhunting, loss of habitat, natural calamity et cetera.

Thus, killing 90 percent of the population of green beetles due to earthquake would be an example of genetic drift.

In addition, the second option is an example of gene flow and the third option is an example of natural selection.