a gene that under certain conditions causes the death of an organism.
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Question 1 of 7
Also called lethal factor, lethal mutation.
Origin of lethal gene
First recorded in 1935–40
Words nearby lethal gene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Medical definitions for lethal factor (1 of 2)
A gene mutation or chromosomal structural change that when expressed causes death before sexual maturity.
Medical definitions for lethal factor (2 of 2)
A gene whose expression results in the death of the organism.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.