Word: triploid
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Dates: during 2000-2009
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...took place. In the first scenario, the egg might have divided in two (without separating) and then each part fertilized by one sperm. Egg division before fertilization is very rare, says Minkin. The second, more likely possibility is that the egg fused with two sperm cells and created a triploid cell. Then, at the second-cell stage, each shed the chromosomes from each of the sperm - or did something to correct its chromosomal count, says Souter. "There are a whole host of potential mechanisms to explain this," she says, "but we really just don't know. We do know there...
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