Null mutation
A mutation (a change) in a gene that leads to its not being transcribed into RNA and/or translated into a functional protein product.
For example, a null mutation in a gene that usually encodes a specific enzyme leads to the production of a nonfunctional enzyme or no enzyme at all.
Read Also:
- Nullipara
A woman who has not given birth to a viable child.
- Nulliparous
Never having given birth to a child.
- Numb
Numb, or numbness is a loss of the sensation of feeling in an area of the body. Numbness results from damage to, or impaired function of, the nerves that supply the affected area. The function of the nerves may be impaired by numerous causes including some chronic diseases (diabetes mellitus, thyroid disease, migraine), trauma, toxins, […]
- Nummular eczema
Coin-shaped patches of irritated skin that most commonly appear on the arms, back, buttocks, and lower legs and may be crusted, scaling, and extremely itchy.
- Nurse
1) A person trained, licensed, or skilled in nursing. 2) To feed an infant at the breast.