What are the expected expressed blood types of children born to a mother who is B/O for blood type and a father who is A/B for blood type?
A)25% A, 25% B, 25% O, 25% AB
B)25% A, 50% B, 0% O, 25% AB
C)50% A, 25% B, 25% O, 0% AB
D)50% A, 25% B, 0% O, 25% AB

Question

Quizplus · Accepted Answer

Blood type alleles A and B are codominant, and O is recessive. Thus when O is paired with either A or B, it is not expressed. When A and B are paired together, both are expressed, and the blood type is AB. In this situation both parents are heterozygous. For each pregnancy there is one chance out of four (25%) of the AB blood type being expressed, two chances out of four (50%) of the B blood type being expressed (with either a B/B genotype or a B/O genotype), one chance out of four (25%) of the A blood type being expressed (from an A/O genotype), and no chance (0%) of an O blood type (O/O genotype) being expressed.

What Are the Expected Expressed Blood Types of Children Born