Question

select all the correct answers.
a mother has blood type a and her son has blood type o. which blood types are possible for the father?
o a b ab

Explanation:

Step1: Analyze blood - type inheritance rules

Blood types are determined by alleles. Blood type O has genotype \(ii\). A mother with blood type A can have genotypes \(I^{A}I^{A}\) or \(I^{A}i\). Since the son has blood type O (\(ii\)), the mother must have genotype \(I^{A}i\) (because she has to donate an \(i\) allele to the son).

Step2: Determine possible father's genotypes

The father must also donate an \(i\) allele. Blood type A (\(I^{A}i\)), blood type B (\(I^{B}i\)), and blood type O (\(ii\)) can all donate an \(i\) allele. Blood type AB (\(I^{A}I^{B}\)) cannot donate an \(i\) allele.

Answer:

A. A, B. B, D. O