The ability to taste the bitter compound phenylthiocarbamide (ptc) is an
autosomal dominant trait. the inability to taste ptc is a recessive condition. in a sample of
500 people, 360 have the ability to taste ptc and 140 do not. calculate frequencies of: a) recessive allele, b) dominant allele, c) each genotype

Explanation:

f(a) = freq of recessive allele

f(A) = freq dominant allele

f(a)^2 = (140/500) = 0,28 -> f(a) = = 0,53

f(A) = 1 - f(a) = 0,47

f(aa) = f(a)^2 = 0,28

f(AA) = f(A)^2 = 0,22

f(Aa) = 1- 0,28 - 0,22 = 0,50

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

i think the answer would be d