Cryptic mutations

See:

http://www.wired.com/wiredscience/2011/06/cryptic-variation/

Article reads: The processes, called cryptic variation and preadaptation, involve mutations that don’t affect an organism when they first occur, and are initially exempt from pressures of natural selection. As they gather, however, at some later date, they could combine to form the basis for complex, unpredictable new traits.

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