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Why is Human Abo Blood Group Gene Considered a Good Example of Multiple Alleles? - CBSE (Science) Class 12 - Biology

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ConceptDeviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy

Question

Why is human ABO blood group gene considered a good example of multiple alleles?

Solution

A gene is represented by two alleles. But, for the blood group in humans, there are three alleles namely IA, IB and i governing the same character. Thus, it is an example of multiple allele.

Allele from Parent 1

Allele from Parent 2

Genotype of offspring

Blood type of offspring

A

A

A I A

A

A

B

A I B

AB

A

i

A i

A

B

A

A I B

AB

B

B

B I B

B

B

i

B i

B

i

i

i i

O

 

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Solution Why is Human Abo Blood Group Gene Considered a Good Example of Multiple Alleles? Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy.
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