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Q.
Out o f the three alleles of gene $I$, the sugar polymers
on the plasma membrane of $RBCs$ is controlled by
how many alleles?
Principles of Inheritance and Variation
Solution:
The plasma membrane of the red blood cells has sugar polymers that protrude from its surface and the kind of sugar is controlled by '$I$' gene. It has three alleles $I ^{ A }, I ^{ B }$ and $i$. Out of these only two alleles $I ^{ A }$ and $I ^{ B }$ produce a slightly different form of the sugar, while allele $i$ does not produce any sugar. Because humans are diploid organisms, each person possesses any two of the three $I$ gene alleles. $I ^{ A }$ and $I ^{ B }$ are completely dominant over $ i$.