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An organism is heterozygous for a gene when it has two different alleles of that gene on the same locus for each of its homologous chromosomes.
An allele is a variable version of the same gene or genetic locus, that is to say, a varied form that can be distinguished by variations in its nucleotide sequence.
An organism is heterozygous for a gene when it has two different alleles of that gene on the same locus for each of its homologous chromosomes.
An allele is a variable version of the same gene or genetic locus, that is to say, a varied form that can be distinguished by variations in its nucleotide sequence.