Mom and Dad both have type A blood. Their first child has type O blood. What does this tell us about Mom and Dad?
A)One of them must have an O gene.
B)Both of them must have an O gene.
C)One of them must be heterozygous type A.
D)Both of them must be homozygous type A.

Question

Quizplus · Accepted Answer

Both parents must have an O gene because blood type is inherited according to Mendelian genetics. For a child to have type O blood, they must inherit an O allele from each parent, indicating that both parents are AO (heterozygous for type A).

Mom and Dad Both Have Type a Blood