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Down's Syndrome

The three dif...

Question

The three different alleles of human ABO blood types will produce how many types of genotypes & phenotypes respectively?

A

4 & 6

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B

6 & 4

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C

6 & 6

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D

4 & 4

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Solution

The correct option is B 6 & 4
ABO blood groups are controlled by a single gene with three alleles and hence it is an example of multiple allelism.

The total number of types of genotypes = $\frac{n (n + 1)}{2} = \frac{3 (3 + 1)}{2} = 6$ , n = number of alleles = 3.

Total types of phenotypes = 4, viz,
A, B, AB, O blood groups.

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