Mind the gap
WHEN dealing with bad genes, nature is a ruthless bouncer. Mutations which diminish an individual's ability to reproduce are weeded out of a population like unwanted guests at a party. But some guests, no matter how dull or offensive, manage to turn up time and again. This raises the suspicion that they owe their popularity to a hidden service that they provide to their host.
This article appeared in the Science & technology section of the print edition under the headline “Mind the gap”
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