6. 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
10. 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 X 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
12. 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
13. 3 sets non- identical
3 pair identical
3 weeks apart
1 week apart
Dizygotic
1st day of kindergarten
Louise and Louis
Dizygotic Teens
16. 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
17. 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
