| − | An '''Allele''' is one or more [[DNA]] sequences in a specific location on a [[chromosome]] that code for a [[gene]]. | + | An allele is one of the variant forms of a [[gene]] at a particular locus, or location, on a chromosome. Different alleles produce variation in inherited characteristics such as hair color or blood type. In an individual, one form of the allele (the dominant one) may be expressed more than another form (the recessive one) |