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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.
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Definition and other additional information on Null mutation from Biology-Online.org dictionary.
mutation /mu·ta·tion/ (mu-ta´shun) a permanent transmissible change in the genetic material. Also, an individual exhibiting such change; a sport.
mutation, in biology, a sudden, random change in a gene gene, the structural unit of inheritance in living organisms. A gene is, in essence, a segment of DNA that has ...