Hormones Control Eyespot Size in the Butterfly Bicyclus anynana

The butterfly Bicyclus anynana has beautiful eyespots on its wings, which function in sexual signaling and predator deflection. For years researchers believed that the differences between male and female wing patterns were regulated cell-autonomously by a gene called doublesex. Now, new research shows that male and female Bicyclus butterflies have different levels of the hormone ecdysone, which regulates their different-sized eyespots.

Source: Entomology Today

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