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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 segment of DNA that encodes function. A chromosome consists of a long strand of DNA containing many genes. A human chromosome can have up to 500 million base pairs of DNA with thousands of genes.hese alleles encode slightly different versions of a protein, which cause different phenotype traits. Colloquial usage of the term having a gene (e.g., good genes, hair colour gene) typically refers to having a different allele of the gene.