Mutations in the GDF9 Gene in Sheep Have Been Linked

question 25

Multiple Choice

Mutations in the GDF9 gene in sheep have been linked to changes in female fecundity. The following are the relative fitnesses of different genotypes in the population. Which statement below is correct?
Genotype Relative fitness
+/ -           1
+/ +           0.7
-/ -           0.1

• A) This is an example of heterozygote advantage; genetic variation will be maintained over time.
• B) This is an example of negative frequency-dependent selection; genetic variation will be maintained over time.
• C) This is an example of heterozygote advantage; genetic variation will be lost over time.
• D) This is an example of negative frequency-dependent selection; genetic variation will be lost over time.

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