A man with blood group AB marries a woman with blood group O. The possible blood groups of their children are:

1. AB blood group has genotype I^A I^B; he passes either I^A or I^B with equal chance. 2. O blood group has genotype ii; she passes only i. 3. A child receives one allele from each parent. 4. Possible combinations are I^A i and I^B i. 5. I^A i gives blood group A; I^B i gives blood group B. 6. So children can be only blood group A or blood group B. _Source: NCERT Class 10 Science Ch 9 'Heredity' (learncbse.in extract)_