Question

List the human blood types and give the possible genotypes for each.

Answer 1

The human blood types and their possible genotypes are:

1. Blood group O: Genotype ii
2. Blood group A: Genotype I^A I^A or I^A i
3. Blood group B: Genotype I^B I^B or I^B i
4. Blood group AB: Genotype I^A I^B (codominance of alleles I^A and I^B)

Here, I^A and I^B are codominant alleles, and both are dominant over the recessive allele i. A person carries two alleles, one from each parent, leading to these genotype possibilities and four phenotypes of blood groups.