First slide

Inheritance of One Gene

Question

In heretozygous condition, the individual expression of both the alleles in the phenotype is exemplified by

Easy

A

Colour blindness
B

AB blood group
C

Rh factor
D

A and B blood group

Solution

ABO blood groups are controlled by the gene I. The plasma membrane of the red blood cells has sugar polymers that protrude from its surface and the kind of sugar is controlled by the gene. The gene (I) has three alleles I^A, I^B and i. When I^A and I^B are present together they both express their own types of sugars: this is because of co-dominance. Hence red blood cells have both A and B types of sugars. Therefore AB blood group is always expressed as I^AI^B.

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