Question

Phenylketonuria (pku) is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what is the probability of all three children with a normal phenotype

Answer 1

●There are three phenotypes, one being intermediate to the other two. Right away suspect incomplete dominance.

●Assume gray is the heterozygote since it has a phenotype between the black and the white rooster.