Multiple Choice
How do natural disasters contribute to genetic drift?
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22. Evolution of Populations
Genetic Drift
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Which is a consequence of a population that has undergone a bottleneck?
A
Enhanced adaptation to new environments
B
Stable allele frequencies
C
Reduced genetic diversity
D
Increased genetic diversity
Verified step by step guidance1
Understand the concept of a population bottleneck: A bottleneck occurs when a population's size is significantly reduced for at least one generation, leading to a loss of genetic variation.
Recognize that during a bottleneck, many alleles (different forms of a gene) may be lost due to the small population size, which limits the genetic diversity.
Consider the impact of reduced genetic diversity: With fewer alleles, the population has less genetic variation to adapt to environmental changes, making it more vulnerable to diseases and other challenges.
Compare the options given: Enhanced adaptation to new environments and increased genetic diversity are unlikely because a bottleneck reduces genetic variation, not increases it.
Conclude that the most direct consequence of a population bottleneck is reduced genetic diversity, as the population loses many alleles during the bottleneck event.
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