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Earlier discussion
1 older comment kept for context.
CHUKA MIKE
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent.