Question

A man with a blood group marry a woman with B blood group their first child is having O blood group what are the possible blood group in their future progenies

Answer 1

If a man with blood group A marries a women with blood group B, it will be a heterozygous condition where ,
the alleles of A blood group will be I^AI^O where the dominant allele is I^A
and the alleles of B blood group will be I^BI^O where the dominant allele is I^B. So the possible genotype of the future progeny will be I^AI^O, I^BI^O, I^OI^O and I^AI^B with blood groups A, B, O and AB respectively.