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scientific twin question



 
 
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Old March 3rd 04, 10:50 PM
Karen
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Default scientific twin question

Just curious about something I come across in my twin reading every
now and again...
I understand the scientific difference between identical and
fraternial twins, but a few times I have seen a statement like
"Boy/Girl twins are usually fraternal" or "boy/girl twins are (almost)
always fraternal"
Wouldn't they ALWAYS have to be fraternal?

Can anyone explain that?

Just curious, and thanks!

-Karen
 




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