Why Is a Species That Has Few Individuals at Greater

question 36

Multiple Choice

Why is a species that has few individuals at greater risk of extinction than a species with a large population size?

• A) A species with few individuals is more likely to be eliminated by a reduction in population size caused by a chance environmental event like bad weather or a fire.
• B) There's no risk to a small population as long as genetic diversity is high.
• C) A species with few individuals is likely to have a high percentage of heterozygotes. This can reduce the likelihood that the species can adaptively evolve in response to environmental changes.
• D) Genetic drift allows small populations to avoid the loss of advantageous alleles from the population.

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