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Q.

ABO blood groups in humans are controlled by the gene I. It has three alleles – IA, IB  and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

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a

One

b

Six

c

Four

d

Three

answer is C.

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Detailed Solution

There are four phenotypes w.r.t. ABO blood grouping system.

 

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