Any of the alternative forms of a gene that occurs at a specific place on a chromosome. A. Gene
B. Allele
C. Chromosome

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Explanation:

B. Allele, An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.

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