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Question

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?


  1. Five

  2. Three

  3. Four

  4. Six+

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Solution

The correct option is C

Four


The correct option is option C.

Explanation of the correct option:

Option C:

  1. A single type of blood group is controlled by a pair of genes.
  2. There is a total of 3 types of alleles, of which IA IB are dominant alleles whereas Iois a recessive allele.
  3. When the genotype is IAIA orIAIo, the phenotypic blood group is A.
  4. When the genotype is IBIB orIBIo, the phenotypic blood group is B.
  5. When the genotype isIAIB, the phenotypic blood group is AB.
  6. When the genotype isIoIo, the phenotypic blood group is O.
  7. Therefore, there are a total of 4 possible types of phenotypic expressions for the gene that controls the human ABO type of blood group.

Final answer: ABO blood grouping is controlled by gene I which has three alleles and show Co-dominance. There are six genotypes and Four phenotypes are possible.


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