In human blood type,types A and B are codominant,producing type AB.They are both dominant to the recessive O type.Which of the following parental genotypes could produce a child with type O blood?
A) AB x AO
B) AO x BO
C) AO x BB
D) None of the above genotypes can produce a type O offspring.

Question

Quizplus · Accepted Answer

In order for a child to have type O blood, they must receive two recessive O alleles (one from each parent). The only way this can happen is if both parents are carriers of the O allele, which means they must be either type A or type B heterozygotes (AO or BO). Therefore, option B (AO x BO) is the only parental genotype combination that can produce a child with type O blood.

In Human Blood Type,types a and B Are Codominant,producing Type