A father with type B blood and a mother with type A blood have a child. Their child, while in a biology lab at school, tests her blood and discovers she has type O blood. Does she have any concerns about her parentage?

A. Yes, because she should have type AB blood if they are her true biological parents.

B. No, because type O blood is possible if her parents both had genotypes AB.

C. No, because both of her parents could be heterozygous.

D. Yes, because both of her parents might be heterozygous.

E. No, because blood types A and B are codominant.

C. you can have an A or B blood type but also have recessive genes that could give an O if parent were heterozygous, like if the mother was A-i (i being recessive gene that could give 'O') and the father was B-i then if you do a punnett square then you can see that there's a 25% chance she has i-i or type O blood.

Answered by cuddlytrex | 2024-06-10

C. if the father was B, the mother was A, and the child had O, then the father had to be Bi and the mother had to be Ai

Answered by 11MusicLover | 2024-06-10

The child with type O blood can indeed have her type from biological parents with type A and B blood if both parents are heterozygous. Therefore, there is no reason for her to have concerns about her parentage. The best answer option is C: No, because both of her parents could be heterozygous.
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Answered by cuddlytrex | 2025-01-26