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Geneotype of the Child

If the mother of a child is blood type O+ and the child is A-, what blood type would the father be? Does the Rh factor of the child being - (negative) mean that one of the parents has to be negative? Both the parents are Rh - all of the siblings are Rh-as well. Could two Rh- parents give birth to a Rh+ child? and visa versa?

The father could be:

(a) A+, A-, or O-
(b) A+, A -, AB+, or AB-
(c) B+, B-, or O-

Solution Preview

B. A+, A -, AB+, or AB-

That is, the father has to be the source of the A allele of a child with blood type A, when the mother is of blood type O. The father could be type A or type AB. The types that can be ruled out for the father are type O and type B as we see below:

Mother's Possible Genotype: 00
Child's Possible Genotypes: ...

Solution Summary

This solution provides the correct answer from a choice of three possible answers and an explanation of the correct answer for the following question: If the mother of a child is blood type O+ and the child is A-, what blood type would the father be? Does the Rh factor of the child being - (negative) mean that one of the parents has to be negative? Both the parents are Rh - all of the siblings are Rh-as well. Could two Rh- parents give birth to a Rh+ child? and visa versa?

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