Biology
bre9
31

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.

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(1) Answers
gingergirl

The O allele (i) is recessive to the B allele (B), so the mother's genotype must be Bi (since she passes on the i allele to her son). In order for that to happen, one of her parents had to have at least one B allele and one i allele. The answer is A.) One of her parents had at least one O allele. The other answers are possible but not necessarily true.

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