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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.
A gene is a stretch of DNA that codes for a polypeptide via an RNA chain. These coded chains lead to âtraitsâ in an individual, such as eye color and blood type. A gene is the basic unit of heredity. An allele is a variation of a gene. Genes come in many different forms, or alleles, that lead to the encoding of different RNA chains and, therefore, different traits.