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Twin

en.wikipedia.org/wiki/Twin

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ..... There can be monozygotic boy/girl twins if the sex gene of the embryo has an extra x chromosome (the ......

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 ...

Monozygotic twins of opposite sex. - NCBI

www.ncbi.nlm.nih.gov/pubmed/11173871

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

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/

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 ...

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

www.madsci.org/posts/archives/1999-07/931746434.Gb.r.html

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 ...

wstwinregistry.org/2015/10/01/can-a-malefemale-twin-pair-be-identical-twins/

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, ...

Are opposite sex conjoined twins possible? - Straight Dope Message ...

boards.straightdope.com/sdmb/showthread.php?t=287791

Simply, they're identical twins, originating from the same embryo, but ... chimeras only survive when their genes combine in such a way that they code ... I'm not sure if cojoined identical twins could have opposite gender since ...

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

scienceline.ucsb.edu/getkey.php?key=4016

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.

FAQ - Australian Twin Registry

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

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.

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

www.theguardian.com/lifeandstyle/2012/sep/15/opposite-sex-twins

Sep 15, 2012 ... And how does that affect their adult romantic relationships? ... My girlfriend is an opposite-sex twin and I've often wondered how the bond she ... and believes that these pairings are less visible than identical or same-sex twins.

More Info

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

www.verywell.com

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 .

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

www.quora.com

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

www.multipletreasures.com

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 ...