If a child has type A blood and the father has type AB blood, which are all the possible phenotypes of the mother?

To determine the possible phenotypes of the mother in this scenario, we need to consider the ABO blood type inheritance pattern. The child has type A blood, and the father has type AB blood.

The father, with type AB blood, can pass on either an A or a B allele to the child. Since the child has type A blood, they must have received an A allele from the father. The other half of the child's genotype must come from the mother. For the child to express type A blood (which can be either genotype AA or AO), the mother must therefore contribute an A allele or an O allele (the O allele does not affect the A phenotype).

The mother can have several possible phenotypes that would allow the child to inherit the necessary alleles. If the mother has type A blood, she could either be genotype AA or AO. If she has type O blood, she contributes an O allele, which combined with the father's A allele results in an AO genotype for the child. If she has type B blood, she can’t provide an A allele but could potentially provide an O allele if she is genotype BO. If the mother has type AB blood, she would also provide an A allele, thus allowing for the child to inherit