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Identical Twin - Wikipedia


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 ......

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 ...

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


Jul 11, 1999 ... Of these 23 sets, one set determines a person's sex - we call this ... There have been rare reports of male and female "identical twins" (see ...

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.

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, ...

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


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 ...

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.

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? ... 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.

human biology - The gender of offspring of Twins? - Biology Stack ...


Oct 29, 2014 ... Given identical twin males, Michael and Douglas, Douglas and his wife have ... the other twin will have children all of the same (or opposite) gender? ... rather a question regarding research of identical twins and their offspring.

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Monozygotic twins of opposite sex. - NCBI


We studied identical twins with the 46,XY karyotype - a male with mixed ... such 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 ... Everything you do in school will be reported to your parents. Every girl ... Why are there so few identical twins of opposite gender? What are the ...

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 ...