An allele ((UK), /əˈliːl/ (US)) (from the Greek αλληλος allelos, meaning each other)'s one member of a pair or series of different forms of a gene. Usually alleles are coding sequences, but sometimes the term's used to refer to a non-coding sequence. An individual's genotype for that gene's the set of alleles it happens to possess. In diploid organisms (two copies of each chromosome) including humans, two alleles make up the individual's genotyp… (More on Allele)