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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 |
|
I A |
I A |
I A I A |
A |
|
I A |
I B |
I A I B |
AB |
|
I A |
i |
I A i |
A |
|
I B |
I A |
I A I B |
AB |
|
I B |
I B |
I B I B |
B |
|
I B |
i |
I B i |
B |
|
i |
i |
i i |
O |
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