its always boy boy or girl girl because the only time that you get boy-girl twins is if it is two different eggs that get fertilised.
Siamese twins happen when one egg is fertilised and doesnt seperate properly into individual twins.
2006-12-04 22:40:17
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answer #1
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answered by Catwhiskers 5
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It can only every be same sex, as it is the failure of a single egg to separate properly that results in siamese twins. Boy-girl twins develop from two separate eggs.
2006-12-04 23:24:18
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answer #2
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answered by Donna M 6
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Didn't you see the Grey's Anatomy episode? They have to be the same sex because they come from the same egg.
2006-12-04 23:40:09
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answer #3
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answered by redunicorn 7
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It's always same sex because they come from the same egg which doesn't divide properly.
2006-12-04 22:29:07
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answer #4
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answered by Roxy 6
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Hello,
Do you mean Fraternal twins? I have fraternal twin girls. Although, my grandma had fraternal Boy-Girl twins 50 years ago.
Hope this helps you............... : - O
2006-12-05 18:59:45
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answer #5
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answered by Anonymous
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not possible, its the same with normal identical twins, if they are mixed they're non identical
2006-12-04 22:31:15
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answer #6
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answered by styce 4
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the same egg splits apart so it would be the same sex
2006-12-04 22:29:01
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answer #7
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answered by hellraiza15 3
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just same sex... it can't be two sexes...
2006-12-04 23:58:42
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answer #8
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answered by Rochelly 2
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same sex
2006-12-05 00:14:46
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answer #9
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answered by melodi_jean_99 3
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