Science glossary film: Allele

Allele

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Alternative forms of a gene, which affect the expression of a particular trait, such as eye colour or blood type.

Alternative forms of a gene, which affect the expression of a particular trait, such as eye colour or blood type. In humans, cells contain two sets of chromosomes, one from each parent, and so two alleles of each gene. If alleles are the same, the organism is said to be homozygous for that trait. If they are different, the organism is heterozygous.

In humans, cells contain two sets of chromosomes, one from each parent, and so two alleles of each gene. If alleles are the same, the organism is said to be homozygous for that trait. If they are different, the organism is heterozygous.

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