Punnett square: Father and mother are heterozygous and each are carriers for a dominant linked disorder. What is the % chance the child will be born with the disorder Punnett square: Father and mother are heterozygous and each are carriers for a dominant linked disorder. What is the % chance the child will be born with the disorder Punnett square: Father and mother are heterozygous and each are carriers for a dominant linked disorder. What is the % chance the child will be born with the disorder Solution parents A a A AA Aa a Aa aa Since parents are heterozygotic carriers their phenotype is Aa Aa The gamets are A a Progeny 25%AA 50%Aa 25%aa ie 1:2:1 25% chance for having the disease(AA) parents A a A AA Aa a Aa aa.