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When butterfly male sex-bias flaps its wings
 

When butterfly male sex-bias flaps its wings

In butterflies, sex is determined by chromosome differences. But unlike in humans with the familiar X and Y, in butterflies, it is the females that determine the sex of offspring. Males are ZZ, while females are ZW. How do females compensate for the loss of genetic information? New research shows that, contrary to previously inconsistent findings, in all species studied, that the expression of Z-linked genes is consistently equalized between the sexes. ... read more

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