Question

Which of the following types of genetic drift involves a dramatic shrinkage in population size followed by a rebound in the population size?
Select one:
a. The bottleneck effect
b. The founder effect
c. Negative-frequency dependent selection
d. Both a and b

Answer 1

a. The bottleneck effect is a type genetic drift that involves a dramatic shrinkage in population size followed by a rebound in the population size.

In the field of biology, bottleneck effect can be described as a type of genetic drift in which the changes in a gene population occur due to a dramatic shrinkage in the population of a species due to environmental or biological disasters.

However, after the dramatic shrinkage, the population of this species again tends to increase over a period of time. Such effect is the rebound effect of the population size and hence occurs in the bottleneck effect. Thus, the correct option is a. the bottleneck effect.

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