How Evolution Can Allow For Large Developmental Leaps

Most evolutionary changes happen in tiny increments. But when it comes to traits like the number of wings on an insect, or limbs on a primate, there is no middle ground. How are these sorts of large evolutionary leaps made? According to new research, such changes may at least sometimes be the result of random fluctuations, or noise (nongenetic variations), working alongside a phenomenon known as partial penetrance.

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