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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 gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene.For example, the gene for eye color has several variations (alleles) such as an allele for blue eye color or an allele for brown eyes.An allele is found at a fixed spot on a chromosome. Chromosomes occur in pairs so organisms have two alleles for each gene â one allele in each chromosome in the pair.lleles may be dominant or recessive. A dominant allele is one that will always be expressed if present. For example, the allele for Huntingtonâs disease is dominant, so if an individual inherits an allele for Huntingtonâs from only one of the parents, they will have the disease.