+ Reply to Thread
Page 1 of 4 123 ... LastLast
Results 1 to 10 of 37
  1. #1
    Mod-Nomsie's Avatar
    Mod-Nomsie is offline Administrator
    Winner 2009/10/11/12/13 - Most helpful Moderator
    Winner 2011 - Naughtiest/Cheekiest Mod
    Winner - Quickest 'Thanker' on the Hub
    Join Date
    Oct 2007
    Location
    Vic
    Posts
    23,657
    Thanks
    6,899
    Thanked
    7,026
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 postsRuby Star - 15,000 postsDiamond Star - 20,000 posts
    Awards:
    200 Posts in a week100 Posts in a weekBusiest Member of the Week - week ended 15/1/15

    Lightbulb Twin Genetics - ID/frat, Are you a chance of having twins etc

    I often see a lot of threads here on BH from people who are newly pregnant/TTC/ just hoping for twins in general asking what they have to do to conceive twins OR that because twins run in their family are they a higher chance of conceiving twins.

    So, I thought I would start a thread and lay down some facts and maybe dispell a few myths along the way. If you have anything to add, feel free to do so

    I am going to close this thread and keep it closed until I have finished with all my posts, and then I will open it all for comment, or for you to add your own pieces.

    To keep it easy to read, each new subject/idea will be put in a new post

  2. #2
    Mod-Nomsie's Avatar
    Mod-Nomsie is offline Administrator
    Winner 2009/10/11/12/13 - Most helpful Moderator
    Winner 2011 - Naughtiest/Cheekiest Mod
    Winner - Quickest 'Thanker' on the Hub
    Join Date
    Oct 2007
    Location
    Vic
    Posts
    23,657
    Thanks
    6,899
    Thanked
    7,026
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 postsRuby Star - 15,000 postsDiamond Star - 20,000 posts
    Awards:
    200 Posts in a week100 Posts in a weekBusiest Member of the Week - week ended 15/1/15
    Do Twins Run in families?

    This is probably one of the biggest myths out there. If I had a dollar for everytime I asked "do you have twins in your family?" I think I would be close to a millionaire. (Well, a girl can dream )

    While some families do seem to have a multitude of multiples, it's most likely more of a coincidence than a connection.

    Certainly, with fraternal twins (two eggs released at ovulation and fertilised) it may be a case of hyper-ovulation; the tendency to release multiple eggs during ovulation. So, in a family where women have the gene for hyper-ovulation, it may be passed on from one woman to the next (hence, many twins in that family).

    Because only women ovulate, this gene is only relevant on the maternal side of the family. Although there is a school of thought that suggests men can carry the gene and pass it on to their daughters. If this is true though, if someone came up and asked you if you had twins in your family because you have twins now, and you only had them on the fathers' side, it is irrelevant that there are a history of twins there or not.

    Identical twins (monozygotic = one egg that seperates) is entirely a freak of nature, and no one knows for sure why it happens. It is thought that it is more prevalent in both IVF babies and older women, as these eggs are less stable.

  3. #3
    Mod-Nomsie's Avatar
    Mod-Nomsie is offline Administrator
    Winner 2009/10/11/12/13 - Most helpful Moderator
    Winner 2011 - Naughtiest/Cheekiest Mod
    Winner - Quickest 'Thanker' on the Hub
    Join Date
    Oct 2007
    Location
    Vic
    Posts
    23,657
    Thanks
    6,899
    Thanked
    7,026
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 postsRuby Star - 15,000 postsDiamond Star - 20,000 posts
    Awards:
    200 Posts in a week100 Posts in a weekBusiest Member of the Week - week ended 15/1/15
    So... am I a chance of having twins?

    Taking in all of the above, if you want it broken down into easier to understand terms,, consider these factors:

    What kind of twins are in the family?
    If they are fraternal (dizygotic) twins, there is a faint possible yes.
    Remember, ID (monozygotic) twins are random.

    Are the twins in your family a result of assisted reproduction?:
    Then no, you are not at an increased chance. With IVF and other assited reproduction methods, there has been a rise in the number of multiple births. But consider this: If your cousin was taking clomid and ended up with twins, then that would have no impact on YOUR ability for twins.

    Whose side of the family has the twins?
    Remember- hyper ovulation can only occur in women. Therefore, if the maternal side of the family has a history of fraternal twins, then you may be in for a chance.
    If it was your fathers side (paternal) kiss that twin idea goodbye, as twins for you will be random.

    Other factors to consider:
    Maternal age, race, weight, diet, reproductive history (including use of assisted reproductive technologies)

  4. #4
    Mod-Nomsie's Avatar
    Mod-Nomsie is offline Administrator
    Winner 2009/10/11/12/13 - Most helpful Moderator
    Winner 2011 - Naughtiest/Cheekiest Mod
    Winner - Quickest 'Thanker' on the Hub
    Join Date
    Oct 2007
    Location
    Vic
    Posts
    23,657
    Thanks
    6,899
    Thanked
    7,026
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 postsRuby Star - 15,000 postsDiamond Star - 20,000 posts
    Awards:
    200 Posts in a week100 Posts in a weekBusiest Member of the Week - week ended 15/1/15
    What is all this monozygotic/dizygotic stuff: Understanding your twins zygosity

    You will have noticed I started to refer to twins as monozygotic and dizygotic. This is mainly for one reason: my boys we are 80% sure* are monozygotic. That means they are 'identical'. The word identical does not describe them though. You can have two babies from the one egg and not have them be EXACTLY the same. There are even some (rare) instances of two babies from the one egg being boy/girl twins.

    *Only 80% because to know for sure I would have to get them tested. Although- they shared a placenta, which accounts for the 80%, but had seperate sacs (which throws in that 20% uncertainty)

    Monozygotic:
    One zygote, or egg.
    This means two babies from one egg. The egg splits apart within the firs few weeks of conception. No one knows why. Hence MZ twins being completely random. The twins share the same DNA split, although sometimes within hours of the split, the DNA in one or both feotuses can morph.

    MZ twins are commonly referred to as identical, but this isn't always the case. They may share VERY similar looks and personalities, but because there are so many outside factors as to what makes up a person, MZ twins are very much their own person. MZ twins can sometimes look very different, and as stated above there have been some b/g monozygotic twins.

    Dizygotic:
    Two eggs released and fertilised.

    The genetic connection is no more or less than to two siblings conceived and developed years apart. Two eggs are released upon ovulation, and are both fertilised by the father. They grow and develop in the womb together, most likely with their own placenta. (Although placentas can fuse to make one) DZ twins may look alike, but then again may be entirely different.



    How can I determine my twins' zygosity:

    The only sure way is DNA testing, since relying on if they look the same or not isn't foolproof.
    There are some indicating factors that I have hinted to above, but remember every rule has it's exception.

    *If your twins shared 1 placenta and one sac, they are most likely monozygotic. They are referred to as monochorionic monoamniotic twins. (Meaning they shared a placenta or chorion, and a sac or amnion)

    * If your twins shared 1 placenta but had their own sacs, again they are most likely monozygotic, but like I pointed out above there is about a 20% chance they are dizygotic, and have fused two placentas to make one. These twins are referred to as dichorionic monoamniotic twins.

    *If your twins each had their own placenta, they are most likely dizygotic. They are referred to as dichorionic diamniotic twins.

    *If your twins are boy/girl, they are most likely dizygotic... the chances of having b/g mz twins are something like 1 in 10,000 (I think- it's some insane number that I can't recall off the top of my head and would have to delve into my research to remember.)

    In the end though, it doesn't really matter what zygosity they are- they are your children and they are beautiful

    (ETA: an excellent way to see all these points laid out infront of you is in this zygosity chart I just found, thanks to about.com
    Last edited by Mod-Nomsie; 24-05-2010 at 15:09.

  5. #5
    Mod-Nomsie's Avatar
    Mod-Nomsie is offline Administrator
    Winner 2009/10/11/12/13 - Most helpful Moderator
    Winner 2011 - Naughtiest/Cheekiest Mod
    Winner - Quickest 'Thanker' on the Hub
    Join Date
    Oct 2007
    Location
    Vic
    Posts
    23,657
    Thanks
    6,899
    Thanked
    7,026
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 postsRuby Star - 15,000 postsDiamond Star - 20,000 posts
    Awards:
    200 Posts in a week100 Posts in a weekBusiest Member of the Week - week ended 15/1/15
    So... I think that is the main stuff covered... if there is anything you would like to add, go ahead... or if I have missed something or gotten something wrong, let me know. This is all just stuff I have picked up whilst reseraching multis when pregnant so some of it may have gotten a little skewiff in my brain

  6. #6
    bgbgbb's Avatar
    bgbgbb is offline To think, I was only going to have 1 child!
    Join Date
    Jan 2008
    Location
    In a house too small for 8 people!
    Posts
    1,965
    Thanks
    183
    Thanked
    120
    Reviews
    1
    Achievements:Topaz Star - 500 posts
    Good thread! If you dont mind me adding my bit, something my ob told me about monozygotic twins might be of interest to us all.

    If the fertilised egg divides before day 5 (after ovulation), the resultant twins will each have their own placenta and sac, as the 'splitting has occurred before implantation into the womb has generally taken place. This accounts for up to 40% of monozygotic twins and explains why some parents cannot understand why their twins look exactly the same when they had separate placentas.

    If the fertilised egg divides between days 5 to 8 the twins will each have their own sac but will share a placenta, as the implantation process will have started. This accounts for approx 80% of mono twins.

    If the fertilised egg divides between days 8 and 12 the twins will share a sac and a placenta. This accounts for only about 2% of mono twins and these pregnancies are very high risk as there is a much greater chance of the cords becoming entangled or twin-to-twin-transfusion syndrome occurring.

    In the fertilised egg divides after day 12 conjoined twins will result, who will also share a sac and a placenta. Fortunately, these are very rare.

  7. #7
    Join Date
    May 2009
    Posts
    2,000
    Thanks
    13
    Thanked
    10
    Reviews
    0
    Achievements:Topaz Star - 500 posts
    Thanks Ladies ...you backed up my research and what my Ob said

    Nomsie - i get the "does twin run in your family all the time" i just say nope i did IVF that usually shuts them up ...mine are Monozygotic and i get ask how i know they are ID before they are born and again i use the cause we only had one egg put back
    and then think to myself unless DH became a freak and regenerated his missing genes there is no other way lol

    Thanks again great thread

  8. #8
    Join Date
    Jan 2009
    Location
    Newcastle
    Posts
    14,956
    Thanks
    0
    Thanked
    634
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 posts
    Chances of tripets-

    1:250,000 of ID triplets. 1 egg split into 3
    1:8000 of fraternal triplets. 3 eggs
    1:10,000 of ID/fraternal mix triplets. 2 eggs, 1 split.

  9. #9
    Join Date
    Jan 2009
    Location
    Newcastle
    Posts
    14,956
    Thanks
    0
    Thanked
    634
    Reviews
    3
    Achievements:Topaz Star - 500 postsAmber Star - 2,000 postsAmethyst Star - 5,000 postsEmerald Star - 10,000 posts
    BGBGBB - 8-12 day egg spliting results in MoMo twins, not mono.

  10. #10
    Join Date
    Oct 2008
    Posts
    635
    Thanks
    0
    Thanked
    0
    Reviews
    0
    Achievements:Topaz Star - 500 posts
    Quote Originally Posted by Nomsie View Post
    You can have two babies from the one egg and not have them be EXACTLY the same. There are even some (rare) instances of two babies from the one egg being boy/girl twins.
    I have seen you quote this before. Are you referring to one egg being fertilised by 2 sperm and then splitting?

    If not, how do you get one male and one female bub from one egg and one sperm? The sperm would be either male (contains Y chromosome) or female (contain X chromosome).


 

Similar Threads

  1. IVF Frat Twins question..
    By Rachael3 in forum pregnancy and babies through IVF
    Replies: 11
    Last Post: 16-09-2012, 08:46
  2. Steelcraft Twin Layback Stroller or Bebe/Childcare Twin Lunar
    By giraffe in forum Maternity products
    Replies: 1
    Last Post: 16-02-2012, 21:00

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
free weekly newsletters | sign up now!
who are these people who write great posts? meet our hubbub authors!
Learn how you can contribute to the hubbub!

reviews
learn how you can become a reviewer!

competitions

forum - chatting now
christmas gift guidesee all Red Stocking
Springfree Trampoline
Give the Ultimate Christmas Gift Springfree Trampoline
The World's Safest Trampoline™ is now also the world's first Smart Trampoline™. Sensors on the mat detect your every move and your jumps control fun, educational and active games on tablet. Secure the Ultimate Christmas Gift today!
sales & new stuffsee all
True Fairies
True Fairies is the first interactive website where children can engage and speak with a real fairy through the unique webcam fairy portal. Each session is tailored to the child, and is filled with enchantment and magic.
Visit website to find out more!
featured supporter
KindyROO
KindyROO offers activities for babies & toddlers in a fun learning centre, focussing on developmental education. Classes are available at three Brisbane and two Gold Coast locations. Enrol today & help your child to reach their full potential. Visit the website to find out more.
gotcha
X

Pregnant for the first-time?

Not sure where to start? We can help!

Our Insider Programs for pregnancy first-timers will lead you step-by-step through the 14 Pregnancy Must Dos!