Question

PKU is a recessive trait that blocks normal metabolism of the amino acid phenylalanine. a homozygous recessive infant will accumulate phenyl ketone molecules in the blood that interfere with normal nervous system development. children with this condition need a lifetime of special care unless they begin a phenylalanine free diet soon after birth and continue until the nervous system is fully developed. newborn testing has made the expression or this condition extremely rare. with no selection against the homozygous recessive condition what does this mean for the allele frequency?

Answer 1