Question

what value did you get for q

For any gene locus with two alleles the following equation is true of allele frequencies p+q=1

Use this equation to identify p, which is the allele frequency for the A allele in our class population.

24 students is the class population and we are taking the square root of q2 value

Answer 1

For a single locus 2 allele system it is convenient to represent the gene frequencies by p and q for A and a respectively.

Now we know from HW equation, the genotypes AA, Aa and Aa have frequencies of p^2, 2pq and q^2 respectively. In dominant genes the phenotype of AA and Aa genotype is the same while aa genotype has a distinct phenotype. Therefore it is easy to calculate q from aa genotype. q then is simply the square root of the PROPORTION of aa, genotype (number of AA individuals / total class strength). And then deduce p by difference method.

Since you have not detailed the phenotype structure of the class actual calculation can't be done here. But I hope you can do it now.