KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation
What is the possible blood group of children whose parents are heterozygous for A and B blood groups?
- A A, B only
- B A, B, AB and O
- C AB only
- D A, B and AB only
Answer & Solution
Correct Answer
(B) A, B, AB and O
Step-by-step Solution
Detailed explanation
(B) A, B, AB and O,
The \(A , B\) and O blood groups are controlled by three different alleles of gene I . These are \(I ^{ A }, I ^{ B }\) and i. In genotype \(I ^{ A }\) i only \(I ^{ A }\) expresses that is blood group A and in genotype \(I^B\) i only \(I^B\) expresses that is blood group B. Similarly, in genotype \(I ^{ A } I ^{ B }\) both \(I ^{ A } I ^{ B }\) are expressed that is blood group AB and in genotype ii no gene is expressed which is known as blood group O . Hence the blood group of children whose prents are heterozygous for A and B blood can be \(A , B , AB\) or O .
The \(A , B\) and O blood groups are controlled by three different alleles of gene I . These are \(I ^{ A }, I ^{ B }\) and i. In genotype \(I ^{ A }\) i only \(I ^{ A }\) expresses that is blood group A and in genotype \(I^B\) i only \(I^B\) expresses that is blood group B. Similarly, in genotype \(I ^{ A } I ^{ B }\) both \(I ^{ A } I ^{ B }\) are expressed that is blood group AB and in genotype ii no gene is expressed which is known as blood group O . Hence the blood group of children whose prents are heterozygous for A and B blood can be \(A , B , AB\) or O .
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