Question

The trees in a certain area are affected by a devastating fungus. Most of the trees die, but a few survive. Seedlings from these trees reestablish the population. During a later outbreak of the same fungus, only a few of the trees die. This is an example of .

A. genetic drift

B. the bottleneck effect

both A and B

neither A nor B

Answer 1

Both A and B

Explanation: This is the bottleneck effect (a severe reduction in population size) which is a specific form of genetic drift (random change in allele frequencies).