Answer:
25% or 0.25
Step-by-step explanation:
The frequency of the genotype Aa from the population can be calculated from the formula;
Frequency of Aa = number of individuals with Aa/total population
number of individuals with Aa genotype = 23
Total population = 41+23+28 = 92
Hence,
Frequency of Aa = 23/92 = 0.25 or 25%