Final answer:
To calculate the expected number of light sunfish for the population to be in Hardy-Weinberg equilibrium, the allele frequencies are determined from the observed genotype frequencies, and the expected number of light sunfish (DD genotype) is calculated using the p^2 term of the Hardy-Weinberg equation.
Step-by-step explanation:
the expected number of light sunfish in Hardy-Weinberg equilibrium:
To determine the expected number of light sunfish in Hardy-Weinberg equilibrium, one must calculate the predicted genotype frequencies based on the allele frequencies in the population. To find the allele frequencies, we first assume that the intermediate sunfish are heterozygotes (Dd) and calculate the allele frequencies from the observed numbers of dark (dd), intermediate (Dd), and light (DD) sunfish.
Under Hardy-Weinberg equilibrium, the frequencies of the genotypes will be p^2 for DD, 2pq for Dd, and q^2 for dd. We can find the expected number of light sunfish by multiplying the total population by the frequency of the DD genotype (p^2).