Question

If one parent has A blood group (homozygous) and the other has B blood group (homozygous), these blood groups are not expected in their children

• A. AB only
• B. A and B only
• C. A, B and O
• D. A and O only

Hint:

Use parental genotypes to list possible gametes → offspring phenotypes.

Answer 1

The Correct Option is C

• Homozygous A = genotype I\textsuperscript{A}I\textsuperscript{A}, Homozygous B = I\textsuperscript{B}I\textsuperscript{B}.
• All offspring will receive I\textsuperscript{A} from one parent and I\textsuperscript{B} from the other → genotype I\textsuperscript{A}I\textsuperscript{B} → phenotype AB only.
• Therefore blood groups A, B and O are **not expected** among the children (only AB is expected).
• Hence the correct answer is (3) A, B and O.