Consider the following population in which the A gene affects bill size, with al

Question

Consider the following population in which the A gene affects bill size, with allele A1 giving larger beaks than allele A2. Is it plausible that the population recently underwent selection, and if so what sort? Assume there is no dominance and that heterozygotes are exactly intermediate in beak size between the two homozygotes. Hint: is the population in Hardy-Weinberg equilibrium? Calculate the allele frequencies and how many individuals there should be of each genotype. Which genotypes are in excess? A1A1:5 individuals A1A2: 80 individuals A2A2: 5 individuals A directional: large bills favored B. directional: small bills favored C stabilizing D. disruptive Eno selection

Explanation / Answer

The population is stabilizing. As we can see that Homozygotes for large sized and small sized bill are only 5 individuals out of 90.

But there are 80 heterozygotes.

That means only the intermediate character is favored.

So, the selection is stabilizing.

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