Essential Genetics 6th Edition by Daniel Hartl

Exercise 2

It is often advantageous to be able to determine the sex of newborn chickens from their plumage. How could this be done by using the Z-linked dominant allele S for silver plumage and the recessive allele s for gold plumage? (Remember that, in chickens, the homogametic and heterogametic sexes are the reverse of those in mammals: Females are WZ and males are ZZ.)