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Sudden Origins Book
Where did all the astonishing variations on the theme of life come from? Darwin persuaded us that God did not create them--earwigs and elephants, ferns and falcons--all at once. He thought one life form gradually evolved into another. But ever since, some have argued that the fossil record makes it look as if some species did appear all of a sudden. The intermediate forms just aren't there in the rocks. Look as hard as you like, the missing links stay missing. Jeffrey Schwartz thinks he knows why. The answer, he says, lies in the recently discovered "homeobox" genes. These are stretches of DNA code which show up across an amazing range of species. Since they regulate the exact way the expanding ball of cells in an embryo grows up, changes in these genes can alter a creature's … read more...
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