Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.

Facultative gene

From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search


noun, plural: facultative genes

(1) A gene transcribed only when needed or when a cell receives a signal from its surroundings.

(2) A gene whose expression is influenced by environmental factors.


Unlike constitutive gene, a facultative gene is not transcribed continually but only when needed.

Compare: constitutive gene.
See also: gene expression.