Biology

The correct answer is D. Genetic Drift.

The scenario described, where a dam in a lake full of blue catfish bursts due to poor engineering and kills some of the blue catfish, is an example of genetic drift.

Genetic drift is a mechanism of evolution that occurs when there are random changes in the frequencies of alleles in a population. It is driven by chance events rather than natural selection or other evolutionary forces.

In this case, the bursting of the dam is a random event that leads to the death of some blue catfish. The individuals that perish in this event represent a random sample from the population. As a result, the genetic composition of the surviving blue catfish population may be different from the original population due to the loss of certain alleles that were present in the individuals that died.

Option A, natural selection, refers to the process by which individuals with advantageous traits are more likely to survive and reproduce, leading to the increas...