Question

blood typing questions
1 if a child has ab blood, and the father is type b blood, which blood types could the mother not be? (two answers)

Explanation:

Step1: Determine the possible genotypes

The child has blood type AB, so the genotype is \(I^A I^B\). The father has blood type B. The possible genotypes for blood type B are \(I^B I^B\) or \(I^B i\).

Step2: Analyze the contribution from the father

If the father has genotype \(I^B I^B\), he can only contribute \(I^B\). If the father has genotype \(I^B i\), he can contribute either \(I^B\) or \(i\). But since the child has \(I^A\), the \(I^A\) must come from the mother.

Step3: Determine non - possible blood types

Blood type O has genotype \(ii\). Since the mother must contribute \(I^A\) (because the child has \(I^A\) and the father cannot contribute \(I^A\) in any case), the mother cannot be type O. Also, for blood type B, if the mother were \(I^B I^B\) or \(I^B i\) and the father is \(I^B I^B\) or \(I^B i\), there is no way to get the \(I^A\) allele for the child from the mother.

Answer:

The mother could NOT be type O and type B.