The frequency of a1a2 genotype in the population will be 0.4.
Frequency can be defined as the rate of repetition of an event or outcome. To calculate the frequency, the number of desired outcome is divided by the total number of possible outcomes.
According to the question,
a1a1 individuals = 20; a1a2 individuals = 80 and a2a2 individuals = 100
Therefore, the total number of individuals in the population = 20 + 80 + 100 = 200
Here the desired outcome is a1a2, which is equal to 80 and the total number of outcomes = 200.
Therefore, frequency of a1a2 individuals = [tex]\frac{80}{200}[/tex] = 0.4
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