Can blood type O and AB produce O?

Yes, blood type O and AB can produce blood type O offspring.

Blood group type is inherited, with three different alleles: A, B and O. Alleles A and B are dominant, while allele O is recessive. Blood group type is determined by the combination of alleles inherited from both parents.

A person with blood type O has two O alleles (OO), while a person with blood type AB has both an A allele and a B allele (AB). When a person with blood type O mates with a person with blood type AB, the possible genotypes and phenotypes of their offspring are:

- AO (blood type A)

- BO (blood type B)

- OO (blood type O)

There is a 25% chance that their offspring will have blood type O (OO genotype).