Question

in this diagram, the colored marbles represent alleles:
what is the best description of the bottleneck effect?
a change in allele frequency due to a dramatic loss of population
an increase in allele frequency due to population growth
allele frequency stays the same regardless of changes in the population size

Explanation:

The bottleneck effect occurs when a population undergoes a drastic reduction in size, often due to natural - disasters or human - caused events. This leads to a change in the frequencies of alleles in the remaining population.

Answer:

a change in allele frequency due to a dramatic loss of population