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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 fertilized egg would be an xxy) then when the ...

www.verywell.com/boy-girl-identical-twins-2447124

Every parent of twins faces the question: "Are your twins identical or fraternal?" When your twins are a boy and girl pair, the answer is easy, but people don't ...

about-twins.com/pregnancy/can-identical-twins-be-male-and-female

Apr 15, 2016 ... If this XXY egg splits it can lose a Y in the process, leaving one embryo with a girls XX combination and her identical twin as an XY boy.

forums.thebump.com/discussion/4428248/identical-twins-can-be-one-boy-one-girl

I am an identical twin (and 31 years old), and just found this out about a month ago. I was watching a show on the Discovery Health channel ...

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 ...

www.reference.com/science/can-boy-girl-identical-twins-f20c37b6ec0408c1

Rarely, a boy and girl may be identical twins. This condition, called Turner Syndrome, afflicts very few pairs of twins. The gender difference occurs when an egg ...

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.

www.ncbi.nlm.nih.gov/pmc/articles/PMC2788685

Oct 14, 2009 ... Healthy twins with a boy and a girl were delivered at 37 weeks 0 days of gestation by a cesarean ... Identical twins and in vitro fertilization.

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 ...

community.babycentre.co.uk/post/a13761555/boygirl_identical_twins_-_possible

Jun 9, 2011 ... Ok so I lost the will to live yesterday listening to my MIL (mother-in-law) and her friends who were arguing that you can get IDENTICAL twins but ...