Alternative versions of genes; located at specific positions on a specific chromosome; interactions between allelic expression lead to trait phenotype. © Nature Education

(Gk: allel= one another) alternative forms of the same gene which can mutate into each other. They lie on the same place on a particular chromosome and affect the same processes.

Alternative forms of a gene.

alternative forms of a gene at a specific locus; a location on a chromosome.

alternate forms or varieties of a gene.   The alleles for a trait occupy the same locus or position on homologous chromosomes and thus govern the same trait.  However, because they are different, their action may result in different expressions of that trait.

Alternate forms or varieties of a gene. The alleles for a trait occupy the same locus or position on homologous chromosomes and thus govern the same trait.  However, because they are different, their [..]

Variant Forms of the same Gene, occupying the same locus on homologous Chromosomes, and governing the variants in production of the same Gene product.

Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product.

Variations of a gene. Altricial:

One of a set of alternate forms of a gene. An example is the different alleles of eye color. Each of the different forms of the gene code for eye color, only each codes for a different color i.e. blue, brown, green.

Mutually exclusive forms of the same gene, occupying the same locus on homologous chromosomes, and governing the same biochemical and developmental process. (12 Dec 1998)