What Accounts for the Fact That Polydactylism Is Prevalent and Tay-Sachs

question 106

Multiple Choice

What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease virtually absent in one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism virtually absent in another?

• A) Natural selection has promoted these differences since humans live in many different environments.
• B) Mutation rates differ between different loci.
• C) There is little gene flow between the two populations.
• D) The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies.
• E) Genetics is an unpredictable science.

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