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twin family
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Twin Family

There are two mechanisms by which this might happen:
- Polar twins (or "polar body twins"), where two sperm fertilize an ovum, one of the two fertilizing a polar body; or where an ovum splits into identical copies, one containing a polar body, prior to fertilization, allowing it to be fertilized by two different sperm.
- Sesquizygotic twins, where two sperm fertilize the one ovum, forming a triploid, and then splitting.

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Filename:237815.jpg
Album name:People & Humanity
Rating (1 votes):55555
Keywords:#twin #family
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Date added:Feb 16, 2010
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