Tuesday, March 27, 2007

Rare Semi-Identical Twins Discovered - Yahoo! News

Rare Semi-Identical Twins Discovered - Yahoo! News: "Twins can be identical, fraternal and apparently semi-identical, scientists now report.

Researchers discovered twins who are identical on their mom's side of the equation but share only half their genes from dad."

Here's how it happened: Two sperm cells fertilized one egg—an event assumed to be very rare—then split into two embryos.

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