Question

A family has three children with blood groups A, B and AB. They genotypes of the parents are

• A. $l^A{l}^A$ and $l^{B}i$
• B. $l^{A}i$ and $l{}^{B}i$
• C. $l^A{l}^B$ and $ii$
• D. $l^B{l}^B$ and $l^A{l}^A$

Answer 1

The correct option is B $l^{A}i$ and $l{}^{B}i$

If the two parents have blood group A and B with genotypes i${}^A$i and i${}^B$i respectively, then the children can have blood group A (if they receive i${}^A$ from one parent and i from the other), blood group B (if they receive i${}^B$ from one parent and i from the other) and AB (if they receive i${}^A$ from the first and i${}^B$ from the other parent). So, the correct option is 'i${}^A$i and i${}^B$i'.