Question

Two parents have two children with type AB blood and two with type O. What are the genotypes of the parents?

Please help! Thanks. (If you don’t know, then don’t answer)

Answer 1

Explanation:

Correct option is C)

Four children have blood groups A, B, AB and O. The genotype of first child will be I

A

I

O

. Similarly, genotype of second child will be I

B

I

O

, of third child will be I

A

I

B

and of fourth child will be I

O

I

O

. As children inherit one allele from each parent, these genotypes are possible only when the genotype of parents is I

A

I

O

(heterozygous for A) and I

B

I

O

(heterozygous for B). Thus, the correct answer is option C.