M Two One
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<div class="quote_poster">Quote:</div><div class="quote_post">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.
"Their similarity is somewhere between identical and fraternal twins," said geneticist Vivienne Souter, of the Banner Good Samaritan Medical Center in Phoenix, Arizona. "It makes me wonder whether the current classification of twins is an oversimplification."
The finding, detailed in the Journal of Human Genetics, was reported today by news@nature.com, the online site of the journal Nature. </div>
Source
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.
"Their similarity is somewhere between identical and fraternal twins," said geneticist Vivienne Souter, of the Banner Good Samaritan Medical Center in Phoenix, Arizona. "It makes me wonder whether the current classification of twins is an oversimplification."
The finding, detailed in the Journal of Human Genetics, was reported today by news@nature.com, the online site of the journal Nature. </div>
Source