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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.
Diffen âº Science âº Biology âº Molecular Biology. A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene.For example, the gene for eye color has several variations (alleles) such as an allele for blue eye color or an allele for brown eyes.iffen âº Science âº Biology âº Molecular Biology. A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene.