Which of the following is the best example of positive frequency dependent selec

Question

Which of the following is the best example of positive frequency dependent selection?

a. Alleles for two genes found next to each other on a chromosome are more likely to be inherited together

b. Sickle cell anemia allele in human populations where malaria is common

c. Aposematic coloration of monarch butterflies

d. Chihuahuas are much smaller than their wild ancestors

a. Alleles for two genes found next to each other on a chromosome are more likely to be inherited together

b. Sickle cell anemia allele in human populations where malaria is common

c. Aposematic coloration of monarch butterflies

d. Chihuahuas are much smaller than their wild ancestors

Explanation / Answer

Positive frequency-dependent selection gives an advantage to common phenotypes. It increases the fitness of the phenotype as it becomes more common. The best example of positive frequency dependent selection is option (b) Sickle cell anemia allele in human populations where malaria is common.

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