Allele

Key Stage 4

Meaning

Alleles are different forms of the same gene.

About Alleles

A single gene, such as the gene for eye colour, may have several alleles such as blue eyes, brown eyes, green eyes...etc.

Alleles can be dominant or recessive.

Dominant alleles are expressed in the phenotype when there is only one copy of the allele. Whereas recessive alleles are only expressed in the phenotype when there are two copies.