Question
Differentiate between multiple allelism and pleiotropy with the help of an example of each.
| S.No | Multiple allelism | Pleiotropy |
| 1. | It is the phenomenon in which a gene for a trait exists in more than two allelic forms. | It is the phenomenon of the ability of a single gene to have more than one phenotypic effect. |
| 2. | The alleles can show codominance. e.g. the gene for human blood groups exists in three allelic forms, 1A, 1B and i. | Codominance is not exhibited. e.g. a single gene in garden pea controls seed shape and size of starch grains. |
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