Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A man with blood group O and a woman with blood group AB cannot have a child with blood group AB or blood group O. Reason (R): The allele for blood group O ( i ) is recessive, and since the child inherits exactly one allele from each parent, all offspring of this couple will be obligate heterozygot

Step-by-step solution

The man has blood group O, so his genotype must be ii . He can only produce gametes carrying the i allele. The woman has blood group AB, so her genotype must be I^A I^B . She can produce gametes carrying either the I^A or I^B allele. Since a child inherits exactly one allele from each parent, every child of this couple will receive an i allele from the father and either an I^A or I^B allele from the mother. This results in the offspring having genotypes I^A i (Blood group A) or I^B i (Blood group B). Because the i