Which equation belongs with diagram A?

B is your answer!!!

No specific explanation...

HOPE THIS HELPS!

The correct answer would be option A.

Explanation:

The allele for the O group is recessive to the allele of B blood group, so the genotype of the mother should be heterozygous with one allele of O and one allele of B blood group because the son has O blood group.

This condition is only possible if one parent of the mother had at least one allele of the O blood group to carry its next generation.

Thus, the correct answer would be option A.