A woman gives birth to a son who has type O blood. She has type B blood. Which of the following can be concluded from this about her parents' blood types?
A.) One of her parents had at least one O allele.
B.) One of her parents had two B alleles.
C.) One of her parents had type B blood and the other type O blood.
D.) One of her parents had type O blood.

Question

A woman gives birth to a son who has type O blood. She has type B blood. Which of the following can be concluded from this about her parents' blood types?
A.) One of her parents had at least one O allele.
B.) One of her parents had two B alleles.
C.) One of her parents had type B blood and the other type O blood.
D.) One of her parents had type O blood.

anonymous · Answer

First of all, her genotype is not BB because she gave birth to a son with type O blood which requires two 'O' alleles (one from each parent). This indicates that her blood genotype is BO (phenotype B).
Therefore she must have inherited a B allele from one parent and an O allele from the other.
So, I believe the answer is C. (:

ashy98 · Answer

thank you soo much!!!(: