Question

genetic drift can also be magnified by natural or human - caused events, such as a disaster that randomly kills a large portion of the population, which is known as the ____________ that results in a large portion of the genome suddenly being wiped out

bottleneck effect
gene flow effect
density dependent effect
random mating effect

Explanation:

The bottleneck effect occurs when a large portion of a population is suddenly killed off (by a natural disaster or human - caused event), leading to a significant reduction in the genetic diversity (a large portion of the genome being wiped out). Gene flow is the transfer of genes between populations. Density - dependent effects are related to population density (e.g., competition for resources as population density increases). Random mating is about how individuals in a population choose mates and does not involve a large - scale reduction of the population genome.

Answer:

A. bottleneck effect