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How do new species form? A clue comes from the ubiquitous Haldane9s rule, which predicts that when offspring of a mating between different animal species display sterility or inviability in one sex only, the afflicted sex has sex chromosomes of different types. In his Perspective, Turelli explains how new results presented in this issue by Presgraves and Orr explain how both of the major hypotheses explaining Haldane9s rule are correct.
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Michael Turelli (1998) studied this question.
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