Basic physical and functional unit of heredity
A unit of heredity composed of DNA occupying a fixed position on a chromosome. A gene may determine a characteristic of an individual by specifying a polypeptide chain that forms a protein or part of a protein
The unit of hereditary material (e.g. DNA) that encodes one protein; sometimes used interchangeably with the word gene.
A theoretical unit of heredity of living organisms; a gene may take several values and in principle predetermines a precise trait of an organism's form (phenotype), such as hair color.