The M allele is at a frequency of 0.2 in a population of 500 west-slope cutthroa

Question

The M allele is at a frequency of 0.2 in a population of 500 west-slope cutthroat trout from Rock Creek that is in Hardy-Weinberg proportions. An outbreak of whirling disease kills 30% of the individuals with the MM genotype, but none of the other fish (i.e., mm or Mm fish)

a. What is the frequency of each genotype before the disease outbreak?

b. Based on these data, what are the fitnesses of each genotype and what is the mean fitness of the population?

c. What is the frequency of each genotype after the disease outbreak?

Explanation / Answer

a. Frequency of each genotype is 2%

b. The sum of the fitnesses of the genotypes of a population weighted by their proportions; hence a weighted mean fitness.

c. frequency of genotype after disease outbreak is 9%

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