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ABO blood groups in human beings are con...

ABO blood groups in human beings are controlled by the gene `I`. The gene `I` has three alleles `- I^(A),I^(B)` and `i`. Since there are three different alleles, six different genotypes are possible
How many phenotypes can occur ?

A

Four

B

Two

C

Three

D

One

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The correct Answer is:
A
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