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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ("identical"), meaning that they develop ... Malefemale twins are the most common result, 50 ...

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


Identical (monozygotic) twins are always of the same sex because they form from a single zygote that contains either male (XY) or female (XX) sex chromosomes ...

Can a boy and a girl be identical twins? | Reference.com


Rarely, a boy and girl may be identical twins. ... egg and sperm that begin as males (sharing XY chromosomes) then change to become a male and female pair.

Can a male and a female be identical twins? - Quora


Identical (monozygotic) twins are nearly identical in terms of genetics, so are almost always the same sex. The exceptions come from very unusual events such...

Can you have identical twins that are male and female? | Yahoo Answers


Jan 29, 2009 ... My boss says that ameoba seperation causes identical twins, but that they can be 1 male and one female. I told him he's insane. Please help ...

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


Identical Twins occur when a single egg is fertilized by a single sperm to form .... rare cases. twins have been born with opposite sexes (one male. one female).

Developmental Biology 10e Online: Non-identical Monozygotic Twins


If the aneuploidy were for the X chromosome, one twin might by male (XY or XYY ) while the other would be female (XO). Such male/female "identical twins" have ...

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


Jul 11, 1999 ... There have been rare reports of male and female "identical twins" (see references below). Truly, none of the twins is genetically identical as ...

human biology - Are there records of monozygotic twins in which ...


Dec 26, 2012 ... In theory you should get what would be about as close as possible to male/ female identical (monozygotic twins). However, I don't believe it ...

Identical Boy Girl Twins? - Twin Pregnancy and Beyond


I have identical boy twins and was told the other day that identical boy twins are ... Babycenter.com not an hour ago that idetical male and female twinsDo exist, ...

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Identical twins CAN be opposite genders! - BabyandBump


This video excerpt from their site says: Identical twins are. ... This can also happen when the egg is fertilized with the male chromosome, making ...

FAQ - Australian Twin Registry


This can happen when two different males father non-identical twins – resulting in half-brothers. ... Sperm cells can survive inside a female's body for 4–5 days.

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


Mar 6, 2008 ... It is possible for there to be boy/girl identical twins but is extrememly rare. ... The reason is that for you to have male/female twins, you needed to ...