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Inheritance of Blood Groups

Concept Explanation

Inheritance of Blood Groups

How Blood Groups are Inherited

A person has one of the four blood groups : A, B, AB or O.

This blood group system is controlled by a gene which has three different forms denoted by the symbols $I^A,I^B$ and $I^O$ . The genes $I^A$ and $I^B$ show no dominance over each other, that is, they are co dominant. However genes $I^A$ and $I^B$ both are dominant over the gene $I^O$ . In other words, the blood gene $I^O$ is recessive in relation to genes $I^A$ and $I^B$ .

Although there are three genes (or three gene forms) for blood, but any one person can have only two of them. So, the blood group of a person depends on which two forms of the genes he poses.

If the genotype (gene combination) is $I^A$ $I^A$ , then the blood group of the person is A. And if the genotype is $I^A$ $I^O$ even then the blood group is A (because $I^O$ is a recessive gene).

If the genotype is $I^B$ , then the blood group of the person is B. And if the genotype is $I^B$ $I^O$ even then the blood group is B (because $I^O$ is a recessive gene)

If the genotype is $I^A$ $I^B$ , then the blood group of the person is AB.

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Sample Questions

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Question : 1

Which of the following are correct ? (a) The genes $I^A$ and $I^B$ show no dominance over each other, that is, they are co dominant . (b) If the genotype is $I^A$ $I^B$ , then the blood group of the person is A . (c) If the genotype is $I^O$ $I^O$ , then the blood group of the person is O.
A. Only (a) and (b) is correct .	B. Only (b) and (c) is correct .	C. Only (a) and (c) is correct .	D. All of these .
Right Option : C
View Explanation

Question : 2

Which of the following are correct ? (a) A person can have one of the four blood groups: A, B, AB or O. (b) The blood group system is controlled by a gene which has three different forms denoted by the symbols $I^A,I^B$ and $I^O$ . (c) If the genotype (gene combination) is $I^A$ $I^A$ , then the blood group of the person is O .
A. Only (a) and (b) is correct .	B. Only (b) and (c) is correct .	C. Only (a) and (c) is correct .	D. All of these .
Right Option : A
View Explanation

Question : 3

Which of the following are correct ? (a) A person can have one of the four blood groups A, B, AB or O. (b) The genes $I^A$ and $I^B$ show no dominance over each other, that is, they are co dominant.
A. Only (a) is correct .	B. Only (b) is correct .	C. Both (a) and (b) is correct .	D. None of these .
Right Option : C
View Explanation

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Attention !!!!!

Inheritance of Blood Groups

Inheritance of Blood Groups

How Blood Groups are Inherited

Students / Parents Reviews [10]

Aman Kumar Shrivastava

Hiya Gupta

Barkha Arora

Ayan Ghosh

Eshan Arora

Om Umang

Shivam Rana

Manish Kumar

Prisha Gupta

Cheshta