An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent.
How are alleles chosen?
One allele is given by the female parent and the other is given by the male parent. The two factors may or may not contain the same information. If the two alleles are identical, the individual is called homozygous for the trait. If the two alleles are different, the individual is called heterozygous.
Where do alleles occur?
Allele, also called allelomorph, any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome. Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.
What pairs of alleles determine?
The pair of alleles present on an individual’s chromosomes dictates what eye color will be expressed.
How many types of alleles are there?
An individual inherits two alleles for each gene, one from each parent. If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous.