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Science 8 June 2001:
Vol. 292. no. 5523, p. 1826
DOI: 10.1126/science.292.5523.1826
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GENETICS:
Why Evolution Might Not Favor Increased Genetic Variability

Marina Chicurel

Evolutionary biologists are often stymied when they try to imagine the evolution of mechanisms designed to increase genetic variability. One reason is that such mechanisms can only be selected indirectly, through the beneficial mutations they create.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)