trans·ver·sion 
(trănz-vûrzhən)
(trănz-vûrzhən)n.
A point mutation in which a purine is replaced by a pyrimidine, or a pyrimidine is replaced by a purine.
[Probably TRANS- + (IN)VERSION.]
- natural-born
- natural capital
- natural childbirth
- natural food
- natural gas
- natural hat trick
- natural history
- naturalism
- naturalist
- naturalistic
- naturalistically
- naturalizable
- naturalization
- naturalize
- natural killer cell
- natural language
- natural law
- natural logarithm
- naturally
- naturalness
- natural number
- natural philosopher
- natural philosophy
- natural resource
- natural rubber latex