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Twin

en.wikipedia.org/wiki/Twin

Monozygotic (MZ) or identical twins occur when a single egg is fertilized to form ..... There can be monozygotic boy/girl twins if the sex gene of the embryo has an  ...

Identical twins CAN be opposite genders! - BabyandBump

babyandbump.momtastic.com/twins-triplets-multiples/114004-identical-twins-can-opposite-genders.html

Identical twins are almost always the same sex, but surprisingly there are a tiny number of boy-girl monozygotic twins. They result from an egg ...

FAQ - Australian Twin Registry

www.twins.org.au/twins-and-twin-families/twin-resources/faq

Can identical twins ever be boy/girl twins? Can fraternal twins look so similar that they are mistaken for identical? What are chromosomes? Can identical twins ...

Is it possible to have boy/girl identical twins? | Yahoo Answers

answers.yahoo.com/question/index?qid=20080306021008AA7vqxY

Mar 6, 2008 ... I have been told from various people that this information is incorrect, and also that it is not possible to have boy/girl identical twins. That they're ...

multiples.about.com/od/funfacts/a/boygirlident.htm
Therefore, boy/girl twins are always fraternal or ( dizygotic ); they can only form from two separate eggs that are fertilized by two separate sperm. The result is either two male twins, two female twins, or one male and one female. However, there have been a few repo... More »
By Pamela Prindle Fierro, About.com Guide

Boy/Girl Identical Twins - Facebook

www.facebook.com/notes/stuff-4-multiples/boygirl-identical-twins/597413480284161/

Boy/Girl Identical Twins. January 23, 2013 at 5:50pm. Can boy/girl twins be identical? Boy/Girl identical twins.... Click here to read our latest article! 7 Likes15  ...

Monozygotic twins discordant for sex. -- Schmidt et al. 13 (1): 64 ...

jmg.bmj.com/content/13/1/64.abstract

A pair of monozygotic, adolescent twins is discordant for sex. The phenotypic female twin has chromosome constitution of 46, XY/45, X. She displays many signs ...

Identical Boy Girl Twins? - Twin Pregnancy and Beyond

www.twin-pregnancy-and-beyond.com/identical-boy-girl-twins.html

I have identical boy twins and was told the other day that identical boy twins are pretty rare but that the rarest type of identical twins are identical boy girl twins.

Types of Twins : Identical, Fraternal & Unusual Twinning | Twin ...

www.twinsuk.co.uk/twinstips/4/140/twin-pregnancy--multiple-births/types-of-twins--identical-fraternal--unusual-twinning/

Identical Twins occur when a single egg is fertilized by a single sperm to form ... form monozygotic boy/girl twins by dropping the Y chromosome for one twin and  ...

What makes some twins of the same sex identical and others not

scienceline.ucsb.edu/getkey.php?key=2909

Identical twins are always the same sex...2 boys or two girls, NEVER one of ... X or Y. When the egg and sperm combine they create either a boy XY, or a girl XX.

Popular Q&A
Q: Identical twins BOY and GIRL?
A: Yes, it is possible, though very uncommon. In school, it is taught that identical twins MUST be the same gender because they contain the same genetic informatio... Read More »
Source: answers.yahoo.com
Q: identical twin boys or identical twin girls?
A: i'd say identical twin girls Read More »
Source: answers.yahoo.com
Q: What if identical twin boys married identical twin girls and had ...
A: That would be a very unusual situation. Note that due to the normal process of genetic reshuffling that is involved in human reproduction, the children of the t... Read More »
Source: wiki.answers.com
Q: Can identical twins be boy and girl?
A: Although extremely rare, there are now documented cases of boy/girl identical twi... Read More »
Source: www.chacha.com
Q: If identical twin boys marry identical twin girls, will their chi...
A: No - however they would Read More »
Source: www.chacha.com