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Eggs Control Fertilization by Choosing Compatible Sperm

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Egg and Sperm. Photo Credit: Ronald Megiddo Sexual selection is responsible for bizarre displays of colors, anatomies, movements, and displays. From peacocks to bonobos, evolution is nothing if not unpredictable. But recent research suggests that females require more than wooing to successfully mate. In addition to foreplay, female’s eggs actually pose a series of challenges to sperm, sending them on a quasi-quest to reach fertilization, or perish trying.