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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.
Noun. 1. heterozygote - (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring. fertilized ovum, zygote - (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell).. heterozygote - (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring. fertilized ovum, zygote - (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell).