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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Not purely true.  Division up to 3 days after fertilization means each new embryo implants separately, sharing nothing.   Suggest you do some research.

And, correct, identical twinning is random, matters not hereditarily.[/quote]

I have done research and have actually had twins.  There are 3 types and whether they are identical depends on the placenta.  Identical twins always share a placenta.  They are either in the same sac (mono-mono) or in different sacs (mono- di).  Fraternal twins don't share a sac or a placenta (di-di).  Suggest you look it up.  [/quote]

This quote is from an old thread of October 2013 due dates, but I had to comment.  [u]Whether they are identical depends on their DNA.[/u]

My wife had[b] dichorionic[/b] (di-di) twins last September.  I know they were conclusively di-di because we saw them at 7 weeks on ultrasound, two distinct different embryos. Not from ART.

Both ended up being girls.  Both O+ blood.  Waited and watched them as they have grown these months.  Same sleep habits, eating, growth pattern.

Just got their zygosity test back today.  They are [b]identical twins[/b].  Identical twins CAN be in 2 separate sacs with separate placentas.  Its more common than you think.  So if you have twins and they are the same gender, and same blood type, and you have trouble telling them apart, and you're wondering...........get tested!  Its fairly easy and about a hundred bucks.[/quote]

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