Two alternative forms of a gene or alleles are located on

Identical loci of the same chromosome

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Non-identical loci of the same chromosome

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Identical loci of homologous chromosomes

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Non-identical loci of homologous chromosomes

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Solution

The correct option is C Identical loci of homologous chromosomes
A gene is located at specific locus on a chromosome. Different genes occupy non-identical loci on a chromosome or on different chromosomes. Allele are the two alternative forms of a gene which are present at the corresponding loci (the identical loci) of homologous chromosomes.
So, the correct answer is option C.

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