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Identical twins - Simple English Wikipedia, the free encyclopedia


They are always of the same sex, and are monozygotic or MZ twins (mono = one; ... For IVF deliveries, there are nearly 21 pairs of twins for every 1,000. ... to be the same sex, while non-identical ...

Identical twins CAN be opposite genders! - BabyandBump


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 ...

Monozygotic twins of opposite sex. - NCBI


Although discordant karyotypes are known in identical twins, cases involving ... as DSS/NR0B1, duplication of which can disrupt the male-determining pathway,  ...

What is it like to have an opposite gender twin? - Quora


I have a twin sister. To answer about being twins of opposite genders, we have always caught ... This is hard enough while not being a twin, but can become even more complicated .... Why are there so few identical twins of opposite gender?

Facts About Identical Twins - Multiple Treasures


Any parent of identical twins will tell you - there is no such thing as identical. ... There have been 3 - 5 documented cases of opposite sex identical twins. This can ...

Re: can identical twins be of opposite genders? - MadSci Network


Jul 11, 1999 ... Truly, none of the twins is genetically identical as they have a different complement of X/Y chromosomes. Their sex chromosomes differ, but ...

Can a male/female twin pair be identical? | Washington State Twin ...


Oct 1, 2015 ... And male/female twins certainly don't look identical! ... The result can be a MZ twin pair of opposite sexes. ... Second example: There could be a glitch in copying sex chromosomes during the formation of sperm or egg cells, ...

How do fraternal twins differ from identical twins? - UCSB Science Line


Identical twins are always the same sex and blood type. Identical ... They can be of opposite sex. ... For identical twins, there is only one egg and one sperm.

A life-long buddy in your own image | Life and style | The Guardian


Sep 15, 2012 ... And how does that affect their adult romantic relationships? ... Opposite-sex twins – boy-girl twins – fascinate me. ... an opposite-sex twin herself and believes that these pairings are less visible than identical or same-sex twins.

FAQ - Australian Twin Registry


Can fraternal twins look so similar that they are mistaken for identical? .... Identical twins are always the same sex; they usually are the same height, weight and ... teeth eruption; Some mirror image twins cross their legs opposite each other.

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can identical twins be opposite sex? | Yahoo Answers


Sep 5, 2009 ... However, there is a very rare anomolie that occurs where you can get twins that have come from the same egg and sperm but are opposite ...

Boy/Girl Twins: Identical Twins of Different Genders - Verywell


This article examines the issue of identical twins of different genders, and the exception of transgender twins. ... Identical (monozygotic) twins are always of the same sex because they form ... Therefore, boy/girl twins are always fraternal or ( dizygotic); they can only ... After it splits, there are either two males or two females .

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


Like singleton siblings. they share 50% of their DNA. ... Two-thirds of all twin births result in same sex fraternal twins and one-third are different sex fraternal twins. ... of identical twins and are identical twins with opposite features. that is one will ...