First slide

Inheritance of One Gene

Question

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

Easy

A

A person will have only two of the three alleles.
B

When $I^{A}$ and $I^{B}$ are present together, they express same type of sugar.
C

Allele ‘i’ does not produce any sugar.
D

The gene (I) has three alleles.

Solution

The gene (I) has three alleles $I^{A}$ , $I^{B}$ and i. A person with genotype $I^{A} I^{B}$ will have both antigens A and antigen B that are slightly different forms of sugar while allele i does not produce any sugar. In an individual only two alleles can be present. Therefore, multiple alleles can be found only when population studies are made.

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