Hardy Weinberg HELP ASAP?

Question

3) A dominate allele, T, codes for the ability to taste the compound phenylthiocarbamide (PTC ). People who are homozygous for the recessive allele,t, are un able to taste PTC. In a Genetics class of 125 students, 88 students can taste PTC and 37 cannot. A) calculate the expected frequencies for the T and t...

Answer 1

Hardy-Weinberg equilibrium equation:
p² + 2pq + q² = 1 (or TT + Tt + tt = 1)
p + q = 1 (T + t = 1)
In this problem: q² = tt =37/125 = 0.296
A) expected frequency for the t allele = q = √q² = √0.296 = 0.544
expected frequency for the T allele = p = 1 - q = 1 - 0.544 = 0.456
B) expected frequency for heterozygous genotype (Tt) = 2pq = 2*0.456*0.544=0.496
expected number of heterozygous students = 0.496 * 125 = 62 students
C) expected frequency for homozygous dominant genotype (TT) = p² = .456² = 0.208
expected number of homozygous dominant students = 0.208*125 = 26 students
D) You could check your answer for part b and c by mating the students who can taste PTC with the students who cannot to observe the phenotypes of the offspring. However, I personally think this is impossible.

Answer 2

Phenylthiocarbamide Ptc