Locus and Homologous Chromosomes
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A locus is a gene's specific position on a chromosome; homologous chromosomes are a matched pair, one from each parent, carrying the same genes at the same loci.
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Each of a person's 23 chromosome pairs is homologous, one member inherited from each biological parent.
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Homologous chromosomes carry the same genes at matching loci, not necessarily the same alleles there.