You searched for: “lethal mutation
lethal mutation (s) (noun), lethal mutations (pl)
A physical change that destroys an organism during any stage of its development before reproduction or birth is completed: Sometimes a primary cause of death from a lethal mutation is easy to identify; such as, certain blood abnormalities.

There are some stillborn fetuses that do not survive their prenatal development because of some kind of lethal mutation.

This entry is located in the following unit: lethal-, -lethal, -lethally; lethi-, letho-, leth- (page 1)