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When butterfly male sex-bias flaps its wings

In butterflies, sex is determined by chromosome differences between males and females. But unlike in humans with the familiar X and Y, in butterflies, it is the females that determine the sex of offspring.

dateJul 06, 2017 in Evolution
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Birds' migration genes are conditioned by geography

The genetic make-up of a willow warbler determines where it will migrate when winter comes. Studies of willow warblers in Sweden, Finland and the Baltic States show that "migration genes" differ - depending on where the birds ...

dateJul 06, 2017 in Evolution
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