Question

(03.04 HC)

Answer 1

Answer:

One of her parents had at least one O allele.

Explanation:

(Took test)

Answer 2

Answer:

A) One of her parents had at least one O allele.

Explanation:

Two alleles are inherited for blood type. Because the woman's son has the O blood type, we can tell that she inherited the B and O alleles. She would have needed to get the O allele from only one other parent. It could either be a recessive allele, like what happened with her son, or from a parent with type O blood altogether (two O alleles).

We cannot tell for sure what blood types her parents had because there are multiple ways to inherit a B and O allele. For example, one parent could have been type AB and the other could have been type O. So, we can only assume what one of her parents' alleles must have been.