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allele. one of two or more alternative forms of a gene at the same site or locus in each of a pair of chromosomes, which determine alternative characters in inheritance. Called also allelomorph. blank allele. an allele which produces an antigen which cannot be detected. null allele. see silent allele (below).
A: The phrase multiple alleles in biology refers to a series with at least three allelic or alternative forms of a particular gene, with only two that are able to exist in a diploid individual. There are two alleles present in an individual: a paternal and a maternal allele.