Great info Adorkable! Maybe what my OB meant was since there's about a 1/3 chance twins are identical then he estimated/rounded up to 35% instead of 33.3333333%. That means he was not taking into account that they were di-di only that the chance was 1/3 they could be identical. So that means it would be a much smaller percentage of di-di same gender would be identical. I'm not super hot with statistics but it's probably a smaller percent like you were saying.
12/9/12 at 9:27am