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  4. ABO blood groups is determined by three different alleles. How many genotypes and phenotypes are possible?

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Q. ABO blood groups is determined by three different alleles. How many genotypes and phenotypes are possible?

KEAMKEAM 2012Principles of Inheritance and Variation

Solution:

The three alleles $I^A, I^B$ and $i$ of gene $I$ in ABO blood group system can produce six different genotypes and four different phenotypes as shown below :
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