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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).
having two different alleles at corresponding loci on homologous chromosomes. An individual who is heterozygous for a trait has inherited an allele for that trait from one parent and an alternative allele from the other parent.An individual who is heterozygous for a genetic disease caused by a dominant allele, such as Huntington's disease, manifests the disorder.aving two different alleles at corresponding loci on homologous chromosomes. An individual who is heterozygous for a trait has inherited an allele for that trait from one parent and an alternative allele from the other parent.