Question

Can two O blood type parents have a non-O blood type child? Explain your reasoning.

Answer 1

But now, the Punnett square looks different! Even though both parents still have blood type A, Dad can pass on either his A or his O gene version. Mom can also either pass on her A or her O. Because of this, you can see that there's 1 in 4 or 25% chance for a child to have OO, or blood type O