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Therefore, a broad, modern working definition of a gene is any discrete locus of heritable, genomic sequence which affect an organism's traits by being expressed as a functional product or by regulation of gene expression.
Answer Wiki. 1 Answer. , Devoted to the Chromosome. A gene is a unit of genetic material (DNA or RNA) that leads to a certain trait. A mutation in that gene that leads to an alternate version means that there are now 2 alleles (specific versions) of that gene: the standard allele and the mutant allele.