key term - Allele

Definition

An allele is one of two or more versions of a gene that are found at the same place on a chromosome.

Related terms

Gene: A gene is a segment on DNA that codes for specific traits in an organism.

Dominant Allele:

A dominant allele is an allele whose trait always shows up in the organism when it's present.

Recessive Allele:

A recessive allele only shows up if no dominant allele is present.