High Quality Content by WIKIPEDIA articles! A gene is a unit of
heredity in a living organism. It is normally a stretch of DNA that
codes for a type of protein or for an RNA chain that has a function
in the organism. All proteins and functional RNA chains are
specified by genes. All living things depend on genes. Genes hold
the information to build and maintain an organism's cells and pass
genetic traits to offspring. A modern working definition of a gene
is "a locatable region of genomic sequence, corresponding to a unit
of inheritance, which is associated with regulatory regions,
transcribed regions, and or other functional sequence regions ."
Colloquial usage of the term gene (e.g. "good genes, "hair color
gene") may actually refer to an allele: a gene is the basic
instruction, a sequence of nucleic acid (DNA or, in the case of
certain viruses RNA), while an allele is one variant of that
instruction.
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