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  4. ABO blood grouping is controlled by gene I which has three alleles and show co dominance. There are six genotypes. How many phenotypes in all are possible?

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Q. ABO blood grouping is controlled by gene I which has three alleles and show co dominance. There are six genotypes. How many phenotypes in all are possible?

MGIMS WardhaMGIMS Wardha 2013

Solution:

The six genotypes are $ {{I}^{A}}{{I}^{A}} $ or $ {{I}^{A}}i,{{I}^{B}}{{I}^{B}} $ or $ {{I}^{B}}i,{{I}^{A}}{{I}^{B}},ii $ The four phenotypes are $ -A,\text{ }B,\text{ }AB,\text{ }O $ .