If grey feathers is a recessive trait, then 72.8% of the population is heterozygous for this trait.
Explanation:
The concept used here is of Hardy Weinberg principle, +2pq =1
The homozygous dominant genotypeis represented as = 84
Red = dominant
The homozygous recessive genotype trait is represented as = 16
grey = recessive
2pq = heterozygous individual
Thus for dominant homozygous the alleles are given as
p=
= 9.1
q =
= 4
for heterozygous individual 2pq
2 x 9.1 x 4
= 72.8
72.8% population is heterozygous for the trait.