Examining a dolphin highlights its evolutionary history. Early in dolphin development, both fore and hind limb buds form. While the forelimb buds continue to develop into , the hind limb buds . The that are normally active in the hind limb buds of four-limbed animals are . A change leading to the silencing of a trait during development may have been an important milestone in cetacean evolution.

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Explanation:

Examining a dolphin embryo highlights its evolutionary history. Early in dolphin development, both fore and hind limb buds form. While the forelimb buds continue to develop into flippers, the hind limb buds disappear. The genes that are normally active in the hind limb buds of four-limbed animals are turned off. A genetic change leading to the silencing of a trait during development may have been an important milestone in cetacean evolution.

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