Question

If the blood groups of parents are homozygous for A and homozygous for B blood groups, these blood groups are not expected in their children

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

Hint:

ABO cross: \[ \boxed{ I^AI^A \times I^BI^B \longrightarrow 100\%\, I^AI^B\;(\text{AB}) } \]

Answer 1

The Correct Option is B

Step 1: Identify the parental genotypes. Homozygous A blood group: \[ I^A I^A \] Homozygous B blood group: \[ I^B I^B \]

Step 2: Determine the genotype of offspring. Cross: \[ I^A I^A \times I^B I^B \] All offspring receive one \(I^A\) allele and one \(I^B\) allele. \[ \boxed{I^A I^B} \] Hence, all children will have \[ \boxed{\text{AB blood group}.} \]

Step 3: Identify the blood groups not expected. Since only AB blood group is produced, \[ \boxed{\text{A, B and O blood groups are not expected}.} \] Therefore, \[ \boxed{(B)} \] is the correct answer.