Biology. In Weismann's theory of heredity, each of the hypothetical units in the germ-plasm supposed to determine the character and development of a…

Genetics. Originally: an agent that is transmitted from parent to offspring and influences or determines a hereditary character; a gene. Now: esp.…

He who or that which determines, in various senses. Biology. = determinant, n. 4.

Biology. A substance responsible for sex determination or sexual differentiation; spec. a gene or group of genes responsible for sex…

= rate gene n.

Genetics. The totality of cytoplasmic or extranuclear genetic factors; the part of a cell's genetic material that resides outside the nucleus.

In some theories: an entity in the cytoplasm of a cell which carries genetic information that can pass to the next generation.

an R plasmid; (also) the part of a conjugative R plasmid which contains the genes involved in conjugation.

Genetics. More fully rho factor. A protein identified in Eschericha coli which is involved in transcription termination at specific sites…