Question

What are alleles ???????

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Answer 1

An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent.

Answer 2

Alleles each of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
or

The definition of alleles are pairs or series of genes on a chromosome that determine the hereditary characteristics. An example of an allele is the gene that determines hair color.

or

A gene is a segment of DNA coding for a particular protein. Alleles are different forms of a given gene.

Every gene can have two or more than two alleles, but, alleles exist only in pairs to produce a phenotypic effect( an observable trait).

For example, the gene coding for height has two alleles -

(i) T - which is the dominant allele and leads to a tall phenotype in homozygous (TT) or heterozygous (Tt)condition ,and

(ii) t -which is the recessive allele, and leads to a dwarf phenotype only in homozygous(tt) condition.

Alleles for a given gene are located at homologous sites of homologous chromosomes, and alleles segregate during gamete formation.

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