A lady I know has a daughter who is pregnant with twins. She said they are in separate sacs so she's pretty sure they are fraternal. That got me thinking. Can ID twins be in separate sacs?
Yes, my identical girls had seperate sacs and seperate placentas, they did not share anything. If they don't share anything then chances are greater that they are fraternal, but unless an ultrasound determines the twins to be 1 boy and 1 girl, you won't know until birth if they are identical or fraternal.
Mine had seperate sacs and placentas (di/di). They look so similar that I will have to get a DNA test done to find out if they are ID or Frat.
didn't read replies but YES. there is a 9% chance that di-di (2 sacs/2 placentas) will be identical twins. Gotta wait and see tho!
QUOTE(pamallhoney @ Sep 23 2008, 01:44 PM) [snapback]993698[/snapback] Mine had seperate sacs and placentas (di/di). They look so similar that I will have to get a DNA test done to find out if they are ID or Frat. Do I need to come over there and swab your kids cheek Pam!? LOL! They're ID you silly rabbit! How've ya been?
Yes, that's why you see so many pictures of twins that look the same but parents are convinced they were fraternal.
My twins are di/di. The ob said due to my age they could be fraternal but due to the family history (or lack of) they could be identical. What determines what id's share or not share is all determined by when the egg splits. The sooner the egg splits the less they'll share in utero. If it splits almost immediately they'll have their own sac and placenta; a few days later, they'll share a placenta; even later, they'll also share a sac; and then if the egg splits past 11 days (i think) they'll share sac, placenta, and body... in other words, conjoined twins.
My twins were di/di (seperate sacs and placentas) and are confirmed ID twins through DNA testing. There is about a 25% chance of having ID twins in seperate sacs and placentas. If her twins are b/g, then yes they are fraternal but if same sex, could be ID. *and just for anyone that says ID b/g twins do exist, yes they do but they are VERY rare and the girl has medical problems.
There is a 9% chance, maybe 10%, but not higher, that they will be di-di ID's not.. 25% That would be incredibly high Given the fact that there is only a 30% chance of having identicals and 70% chance of having frats then.. 30% of the 30% of IDENTICAL twins will be Di-Di identical twins.. Does that make sense? Which equates to exactly 9%, give or take a bit. Hope this helps!! And yes indeed it IS possible to have b/g ids but it would be due to a chromosomal abnormality and isn't something that happens every day.. it hardly ever happens so it's really not something that we need to take into consideration on an everyday basis.. it's considered HIGHLY HIGHLY HIGHLY unlikely.
I think I read that 25% of identical twins are di/di...maybe that is the source of the confusion? That's different than 9% of all di-di pregnancies are IDs. Hope I'm not adding any additional misleading facts!!! Jen
Yep, I have ID boys that were in separate sacs etc. Also one was anterior and one was posterior...so that has no bearing on it either.
QUOTE(angie7 @ Sep 24 2008, 01:05 AM) [snapback]994248[/snapback] I read it was 25% ardon:, maybe they didn't know what they were talking about... The confusion with that comes when there is a mix-up between the number of di/di pregnancies as a percentage of identicals (25-30%) and the number of di/di pregnancies that are identicals (8-10%). If those twins end up being the same sex and looking similar, she can also get their blood types checked to see if they are same. If the blood types are different, then they're frats.
