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  • 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?Option

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?

Option: 1

Six


Option: 2

Three


Option: 3

Four


Option: 4

Five


Answers (1)

best_answer

The inheritance of human blood groups is an example of codominance and multiple alleles. It is controlled by three alleles, namely I A, I Band i. I A and I show codominance, while the "i" allele is recessive for "IA" and "IB". This gives a total of six genotypes and four phenotypes - A (IA I A and I A i), B (I B I B and I B i), AB (IA I B) and O (ii). Hence, option 3 is correct.

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