In a small tribal population, the frequencies of two alleles A and a at a particular locus were 0.3 and 0.7, respectively. However, not all the individuals with genotype aa could live up to the reproductive age and the relative fitness of this genotype was found to be 0.5. The remaining genotypes had a relative fitness of 1. What is the expected percentage of heterozygotes among newborns in the next generation?
My answer is : 37 % but the answer given 43.52 %
I did the following : First I assumed the population to be of 100 individuals and then I counted the no of individuals with respective genotypes. Then I assumed that each person leaves 1 offspring except the aa ones which leave 0.5 offsprings and then I calculated the new genotype frequency from this.