Multiple Allelism

Multiple Alleles

As each gene may exist in alternative forms known as alleles, which code for different versions of a particular inherited character.

A part from that some genes may exist in three or more allelic which may be called as multiple alleles.

It is important to note that while multiple alleles occur and are maintained within a population, any individual possesses only two such alleles (at equivalent loci on homologous chromosomes).

Characteristics of Multiple allelism

A single gene has more than 2 alleles.
Only 1 allele of a particular gene occupied by a gamete or a chromosome.
Various alleles of the same gene express different alternative of same trait.
Multiple alleles in a homologous chromosome occupy the similar locus.

Examples of Multiple Allelism

ABO Blood group in Humans.
Skin Colour.
Eye colour in Drosophila.
Coat colour in Rabbit.

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Allele definition biology || NEET | AIIMS ||

Alleles Each gene may exist in alternative forms known as alleles, which code for different versions of a particular inherited character. We may also define alleles as genes occupying corresponding positions on homologous chromosomes and controlling the same characteristic (e.g. height of plant) but producing different effects (tall or short). The term homologous refers to chromosomes that carry the same set of genes in the same sequence, although they may not necessarily carry identical alleles of each gene. Wild-type Alleles Normal or Prevalent alleles in a population are called wild-type alleles. These alleles typically encode proteins that are made in the right amount and function normally. Mutant Alleles Alleles that are present at less than 1% in the population and have been altered by mutation are called mutant alleles ....

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