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Question about Identical and Fraternal twins


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  #1  
February 20th, 2011, 06:49 PM
nat1970's Avatar Nicole - Mom2Leah,Ty,TJ
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A friend that I went to school with has 5 yr old twin girls who look identical. I told her I did the zygosity testing and now she is thinking of doing it. I asked if she had 2 sacs and 2 placentas, but she said she had two sacs and one placenta. Her OB said the could be either. I've never heard of 2 sacs and 1 placenta. Can anyone please explain? Unless the placentas fused, but if that is the case they could still be id right?
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  #2  
February 20th, 2011, 09:34 PM
Jara's Avatar Mega Super Mommy
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Was she possibly meaning that they were Mono/Di twins?

Quote:
Identical Twins

With identical twins, one egg (zygote) from the mother is fertilized by one sperm from the father, and then very early in development the embryo splits and two fetuses grow. Spontaneous division of the zygote into two embryos is not considered to be a hereditary trait, but rather a spontaneous or random event.

If the zygote splits very early (in the first 2 days after fertilization) they may develop separate placentas (chorion) and separate sacs (amnion). These are called dichorionic, diamniotic (or 'di/di') twins. While all fraternal twins are 'di/di', this occurs 20 - 30% of the time in identical twins.

Most of the time in identical twins the zygote will split after 2 days, resulting in a shared placenta, but two separate sacs. These are called monochorionic, diamniotic ('mono/di') twins.These twins are very similar genetically, and share a single afterbirth.

Very occasionally, twins will also share the same sac (fluid cavity). In about 1% of identical twins the splitting occurs late enough to result in both a shared placenta and a shared sac. These are called monochorionic, monoamniotic ('mono/mono') twins.
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  #3  
February 21st, 2011, 05:17 AM
Celry's Avatar Platinum Supermommy
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My girls are mono/di. 2 sacs and 1 placenta.

It's possible for frats to look like there is 1 placenta if the 2 placentas fuse. Sometimes that fusion can be seen via u/s and sometimes it can be seen once the placenta is delivered.
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  #4  
February 21st, 2011, 05:40 AM
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My girls are also mono/di identicals (two sacs, one placenta). Actually with my girls it looked like they were in the same sac but a thin membrane separated it into two.
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  #5  
February 21st, 2011, 06:21 AM
Lindsey.'s Avatar Veteran
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Mine were also mono/di. As a PP stated, one placenta almost always means identicals because the egg splits after implantation, unless it is really two placentas fused together.

In our case, the dr confirmed one placenta (not fused) and therefore identicals, when he did the c-section.
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  #6  
February 21st, 2011, 07:41 AM
Celry's Avatar Platinum Supermommy
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Quote:
Originally Posted by angeleyes04 View Post
My girls are also mono/di identicals (two sacs, one placenta). Actually with my girls it looked like they were in the same sac but a thin membrane separated it into two.
That's how A&E were. We had more than one u/s tech comment that if they'd split a few hours to a day later they would have been in the same sac. They said that because A&E's umbilical cords inserted into the placenta at almost the exact same spot. That's also why our drs. were so concerned about the possibility of ttts.
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  #7  
February 21st, 2011, 08:00 AM
nat1970's Avatar Nicole - Mom2Leah,Ty,TJ
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Thanks for the input. That is what I thought mono/di and that is what I told her. Told her to save her money that hers were id. They look exactly alike.
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  #8  
February 21st, 2011, 08:17 AM
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Quote:
Originally Posted by Celry View Post
That's how A&E were. We had more than one u/s tech comment that if they'd split a few hours to a day later they would have been in the same sac. They said that because A&E's umbilical cords inserted into the placenta at almost the exact same spot. That's also why our drs. were so concerned about the possibility of ttts.
Ditto. I could never see the membrane with my un-trained eye and at first I doubted that all the u/s techs that checked knew what they were talking about. lol. DH took a picture of the placenta after they were born and one of the docs held up the membrane separating the two sacs. I know it was kind of weird that he took a pic, but he was so amazed by the shared placenta. lol. It was pretty cool to see.

There is actually a lady in my Multiples group that is pregnant right now with mo/mo (shared placenta and sac) twin girls. She is 27 weeks right now and thankfully they show no sign of TTTS and both cords are still producing great blood flow. She's doing well in the hospital on bed rest now, but she's a nervous wreck (I would be too). They are trying to make it to at least 30 weeks. I'm hoping they do. It is so crazy how many different ways twins can develop in the womb. I am so thankful I live in this day and age with all the medical technology we have now. I probably wouldn't have known I was carrying twins until delivery day.
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