logo
g Text Version
Beauty & Self
Books & Music
Career
Computers
Education
Family
Food & Wine
Health & Fitness
Hobbies & Crafts
Home & Garden
Money
News & Politics
Relationships
Religion & Spirituality
Sports
Travel & Culture
TV & Movies

dailyclick
Bored? Games!
Nutrition
Postcards
Take a Quiz
Rate My Photo

new
Painting
Heart Disease
Horror Literature
Dating
Hiking & Backpacking
SF/Fantasy Books
Healthy Foods


dailyclick
All times in EST

Full Schedule
g
g Twins Site

BellaOnline's Twins Editor

g

Monozygotic and Dizygotic Twins


We are commonly asked about the differences between monozygotic and dizygotic twins. As a twin mom, I know that the first thought I had when I was told I was having twins (besides "my husband is going to freak out") was, "identical or fraternal?" How will I tell them apart if they are identical? After the initial shock, you want to know the differences between identical and fraternal twins, as well as the chances of having each kind. Below I have compiled some information that new twin moms should find interesting...

Identical twins are often referred to as monozygotic; they begin life as a single fertilized egg, and shortly afterward split into two (well before they can be seen clearly by ultrasound). Contrary to popular belief, there are no hereditary factors at play in the incidence of identical twin births. Families that have identical twins in multiple generations are simply lucky. They account for approximately one-third of all live twin births.

The chances are also not affected by IVF; there is no increase in chances of a single egg splitting no matter the method of fertilization. However, the time it takes for an egg to split into twins after fertilization does affect the similarities between the children. An embryo that splits before day four will result in "less identical" twins than an egg that doesn't split until day ten. Also, approximately 99.9% of identical twins are the same sex.

Fraternal twins are referred to as dizygotic-they begin as two separate eggs fertilized at different (but close) times. Dizygotic twins are the more prominent type-occuring in the other two-thirds of twin births. IVF is a factor here, as the medications lead to the production of egg release-thus producing greater chances of multiple egg fertilization. Fraternal twins actually can be hereditary, as a predisposition to releasing more than one egg (hyperovulation) can be passed on through a maternal gene.

Several statistics show to be a factor in conceiving fraternal twins. Women above average height, as well as those with a BMI (Body mass index) over 30 show an increased frequency of multiples. Other factors include a previous twin pregnancy, IVF medications (because of the stimulation of the ovaries), and certain food items. There is actually a tribe in Africa (the Yorubas) with the highest rate of twins in the world. A study concluded that the frequent consumption of a cassava (a type of sweet potato) led to an increased stimulation of their ovaries!


Add Monozygotic+and+Dizygotic+Twins to Twitter Add Monozygotic+and+Dizygotic+Twins to Facebook Add Monozygotic+and+Dizygotic+Twins to MySpace Add Monozygotic+and+Dizygotic+Twins to Del.icio.us Digg Monozygotic+and+Dizygotic+Twins Add Monozygotic+and+Dizygotic+Twins to Yahoo My Web Add Monozygotic+and+Dizygotic+Twins to Google Bookmarks Add Monozygotic+and+Dizygotic+Twins to Stumbleupon Add Monozygotic+and+Dizygotic+Twins to Reddit




Boy/Girl Identical Twins
RSS
Related Articles
Editor's Picks Articles
Top Ten Articles
Previous Features
Site Map


For FREE email updates, subscribe to the Twins Newsletter


Past Issues


print
Printer Friendly
bookmark
Bookmark
tell friend
Tell a Friend
forum
Forum
email
Email Editor


Content copyright © 2013 by Julixa Newman. All rights reserved.
This content was written by Julixa Newman. If you wish to use this content in any manner, you need written permission. Contact Julixa Newman for details.

g


g features
Comparing Your Twins

Twin Toddler Sleep Tips

Twins and Homework

Archives | Site Map

forum
Forum
email
Contact

Past Issues
memberscenter


vote
Poetry
Daily
Weekly
Monthly
Less than Monthly



BellaOnline on Facebook
g


| About BellaOnline | Privacy Policy | Advertising | Become an Editor |
Website copyright © 2013 Minerva WebWorks LLC. All rights reserved.


BellaOnline Editor