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Uh oh. I pull it up fine, but maybe it's broken somewhere since posting it? Oh well. Thanks for the heads up!
If I'm thinking right, your Gma would have been a result of a monozygotic twin; they have identical DNA and did start as one or fused at a a blastocyst or earlier stage. A double yolker would be a fraternal or dizygotic twin which do not share identical DNA. Identical/conjoined twins could occur in an egg, but it'd be a single yolk.Ahh Haha I assumed it's kinda like my Gma who has a small pair of ribs attached to hers from absorbing her twin. But very neat info! Still wouldn't buy it...might scare the kids.