Which one of the following could NOT be the genotypes of the parents of a child with the blood group "O" Rh ^ +ve ?

Step-by-step solution

Blood group O requires the genotype I^0 I^0 . For a child to have blood group O, both parents must contribute an I^0 allele. Parents with the genotype I^A I^B do not possess the I^0 allele. Therefore, they can only produce offspring with blood groups A, B, or AB (genotypes I^A I^A , I^B I^B , or I^A I^B ). Thus, parents with genotypes I^A I^B Rh ^ +ve and I^A I^B Rh ^ +ve cannot have a child with blood group O. Answer: I^A I^B Rh ^ +ve and I^A I^B Rh ^ +ve