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Offspring's Blood Type

What if the mother is type O+ and the father is A-? What would the offspring's blood type be?

The offspring could be:

(a) A+, or O+
(b) A-, or O-
(c) A+, A-, O+, or O-
(d) A+, or O-

Solution This solution is FREE courtesy of BrainMass!

The answer for this question is:

(c) A+, A-, O+, or O-

Let's look at what factors determine what blood type wins over the next. First, inheritance plays a role. Both the ABO blood type alleles and the Rh factor genetic information are inherited from our parents, but they are inherited seperately.

Blood types are also important to consider.
The mother of the child is blood type 0. We know that she is homozygous. The father could be homozygous with two alleles of type A or he may be heterozygous with one allele of type A and one allele of type O. If the father is heterozygous, there is a 50% probability for a blood type A child and a 50% probability for a blood type O child. If the father is homozygous, every offspring will be blood type A.

Mother's Possible Genotype 00 00
Father's Possible Genotypes OO AA AO
Child's Possible Genotypes OO AO AO, OO

Thirdly, the Rh factor impacts blood type. The mother of the child is Rh+. She may be homozyous or she may be heterozygous with one Rh+ allele and one Rh-allele. If the mother is heterozygous, because the father is Rh-, there is a 50% probability for an Rh+ child and a 50% probability for an Rh- child. If the mother is homozygous, every offspring will be Rh+.

Mother's Possible Rh factor:
Rh+Rh+, Rh+Rh-

Father's Possible Rh factor:
Rh-Rh-, Rh-Rh-

Thus, child's Possible Rh factor:
Rh+Rh-, Rh+Rh-
Rh+Rh-, Rh-Rh-

Again, the correct answer is (c).

I hope this helps. Be sure to read your text and notes as well. Good luck in your studies.

BEST OF LUCK!