Awoman 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.

The correct answer would be option A.

Explanation:

The allele for the O group is recessive to the allele of B blood group, so the genotype of the mother should be heterozygous with one allele of O and one allele of B blood group because the son has O blood group.

This condition is only possible if one parent of the mother had at least one allele of the O blood group to carry its next generation.

Thus, the correct answer would be option A.

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