Twin GeneticsA brief presentation for

Medical Terminology, American National UniversityBy

Myra BaileyMay 2016

Introduction to Twin GeneticsA. A brief presentation on Twin GeneticsB. The two types of twin developmentC. Special considerations

Two Basic Types of Twin Development

Monozygotic

Dizygotic

Dizygotic Monozygotic

Polar Body Twins

Monozygotic Twins

A sample of Libby's placenta confirmed the twins are 100 per cent genetically identical, despite them looking nothing alike

By SIOFRA BRENNAN FOR MAILONLINE

PUBLISHED: 07:50 EST, 24 February 2016 | UPDATED: 08:47 EST, 24 February 2016

 : http://www.dailymail.co.uk/femail/article-3461832/First-identical-twins-different-skin-colour-born-UK.html#ixzz47YI6CWIB

Mirror Image-MonozygoticAsymmetrically Opposite

Mirror Image Twins

Special Considerations Prematurity

• <38 weeks• 38 weeks is considered normal for twins

TTTS• One twin transfuses blood to the other

and becomes anemic• The donor twin receives too much blood

and hemorrhages Mirror Imaging

• When the heart is affected • a valve might reverse the blood flow

Turner Syndrome-monozygotic• XY boy and X0 girl• one normal boy and • one girl with slow physical

development, or premature aging

Monochorionic Monoembryonic• Sharing the same chorionic sac and

embryonic sac• Umbilical cord wraps around babies

Examples of Twin to Twin Transfusion SyndromeWhen there is a blood vessel connection between monozygotic twins

About 28 weeks gestation

In Summary• This has been a brief presentation of Twin Genetics

• Many unexplainable developments occur in twinning

• Healthy twins require careful gestational monitoring and care

3 sets non- identical

3 pair identical

3 weeks apart

1 week apart

Dizygotic1st day of kindergarten

Louise and LouisDizygotic Teens

Credits• www.multipletreasures.com• www.proactivegenetics.com• http://www.twinsuk.co.uk/twinstips/• http://www.mindblowing-facts.org• http://www.independent.co.uk/• VeryWell, an www.about.com brand, By Pamela Prindle Fierro - Reviewed by a board-certified

physician. Updated April 19, 2016• http://

www.everydayhealth.com/healthy-living-pictures/wonderful-and-wacky-facts-about-twins.aspx#07

• www.reddit.com• http://imgur.com/gallery/Kj2YuIT• SonStarPublications©

Identical Twin Dateswww.reddit.com http://imgur.com/gallery/Kj2YuIT

If a pair of identical male twins marry a pair of identical female twins, their children will legally be cousins but genetically be full siblings

20 Mind-Blowing Facts You Never Knew About Twins/distractify.com650 × 433Search by image

Identical twins Venice Shaw, left and Inez Harries, 100 years old, are photographed at Harries' home in Sylmar.

http://framework.latimes/2011/12/28/the-year-in-pictures-2011