Identical Twins Often Called Fraternal

Avatar for cmkristy
iVillage Member
Registered: 07-05-2005
Identical Twins Often Called Fraternal
7
Thu, 03-08-2012 - 10:54am

Hi everyone!

I came by this article today and thought it was quite interesting!

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Avatar for mygoosebump
iVillage Member
Registered: 04-02-2003
Thu, 03-08-2012 - 3:41pm

This is incredibly common! MOst Dr. assume that 2 sacs 2 placenta automatically mean fraternal, but if the egg split the first 72 hours each baby will have it's own support system.

This is what I always posted on this board when I was the Cl:

Ladies 2 sacs & 2 placentas is NOT a guarantee that your twins are Fraternal. Id twins can have

1 sac/1placenta(very rare) 1%


2 sac/1placenta(most common...about 74.5%


2 sacs/2placentas(happens 24.5% of the time)


ID Don't HAVE to share anything if the egg split in the first 72 hours.

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Community Leader
Registered: 11-01-2011
Thu, 03-08-2012 - 3:51pm

this is so interesting Kristy, because even though we have 3 placentas 3 sacs, twins are common in my family and it would make sense for one of mine to have split.

Wendy

iVillage Member
Registered: 07-16-2008
Sat, 03-10-2012 - 3:57pm
But ID twins aren't genetic, so that may not even matter in the long run.

I was told from day one they were definitely fraternal (and mine are) but I argued they *could* be ID. The tech looked at me like I was nuts. ;-)
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iVillage Member
Registered: 03-07-2012
Sat, 03-10-2012 - 10:07pm
I'm willing to bet money the twins will be identical. If DH family history holds, they'll be girls also.

His family, going back 14 generations, track back the paternal side and there are twins. There are twins proven identical at 9 generations back as the twins shared a sac. There are numerous old reports of what seems to be twin to twin transfusion. Genetic testing going back 3 generations proves that of the 17 sets of twins, all are identical. However, all the twins are female.

Numbers sound huge, but we are talking that the first known father to produce twins had 7 sons who lived to child producing ages. The son that is in DH line had 3 sons. The family is huge and spread far and wide. Reality is we really aren't over the 1/250 odds for identical twins. If DH and I stop with 4 kids, his tiny part of this tree stops with no sons.

It's just when you have a family of science geeks mixed with history nerds, well they like tracking this.
Community Leader
Registered: 11-01-2011
Sun, 03-11-2012 - 9:05am
Are you pregnant with twins, pantommom? If so, grats :)

Wendy

iVillage Member
Registered: 03-07-2012
Sun, 03-11-2012 - 12:14pm
Yes, due October 30th. The girls are excited so far.
iVillage Member
Registered: 07-16-2008
Sun, 03-11-2012 - 4:52pm
Congratulations PantomMom :-)

Although that long history is fascinating, it's all coincidence.

"What About Identical Twins?

Although theories and research abounds, there is no established connection between genetics and monozygotic (identical) twinning. Scientists haven't really identified and confirmed a clear cause for monozygotic twinning, which occurs when a fertilized egg splits and develops into two (or more) embryos. About ten years ago, I read about a theory that suggested that there was an enzyme in sperm that could cause an egg to split after fertilization, however I have not encountered any conclusions from that research. At this time, monozygotic twinning appears to be a random event, and all parents have a reasonably equal chance of conceiving identical twins."
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