From bug eyes to aquiline noses, square jaws to chin dimples, no two faces are alike. That diversity may have evolved to make it easier to recognize other people.
Researchers from the University of California, Berkeley, USA, found that the shape and configuration of a human face are much more variable, compared with other body parts. What's more, genes that have been linked to face structure vary more than DNA in other regions of the body.
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This is typical of features that are undergoing sexual selection. Features with fitness-increasing functions, like a skull, tend to converge on a design instead.
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