Aman with blood type a and a woman with blood type b can have a baby with blood type o blood. true because a and b are the dominant blood types and both individuals could carry a type o allele. false, the child must have type ab blood. true because a and b are codominant. false because type a and b are dominant blood types and these individuals cannot have an offspring with the recessive blood type. true because only 1 o allele is needed.