Question
Even if a character shows multiple allelism, an individual will only have two alleles for that character. Why?

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 $I^A, I^B$​​​​​​​ and $i$ alleles which govern the $ABO$ blood grouping in humans.

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