QUESTION 2 Consider the following population in which the A gene affects bill si
ID: 149028 • Letter: Q
Question
QUESTION 2 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 O A directional: large bills favored O B. directional: small bills favored OC stabilizing O D- disruptive O E. no selectionExplanation / Answer
Total number of individuals in the population is 5 + 80 + 5 = 90
Population with A1A1 genotype = 5
Frequency of A1A1 genotype = 5/90
= 1/18
Population with A1A2 genotype = 80
Frequency with A1A2 genotype = 80/ 90
= 8/9
Population with A2A2 genotype = 5
Frequency = 5/90
= 1/ 18
The genotype A1A2 is in excess because 8 out of 9 individuals have this genotype.
The population shows stability with no selection.