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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation2 Marks
Question
Even if a character shows multiple allelism, an individual will only have two alleles for that character. Why?
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Answer

Most of the organisms are diploid and thus alleles can only be present in pairs. Hence, in spite of multiple allelism; an individual will only have two alleles for that character. A good example of this can be shown by IA, IB and i alleles which govern the ABO blood grouping in humans.

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