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en.wikipedia.org/wiki/Twin

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ("identical"), meaning that they develop ..... There can be monozygotic boy/girl twins if the sex gene of the embryo has an extra x chromosome (the ...

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

Oct 23, 2017 ... Can boy/girl twins be identical? Learn the difference between fraternal and identical twins and how it determines whether they can be different ...

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.

www.healthychildren.org/English/family-life/family-dynamics/Pages/The-Difference-Between-Identical-and-Fraternal-Twins.aspx

Nov 21, 2015 ... Identical, or monozygotic, twins may or may not share the same ... If twins are a boy and a girl, clearly they are fraternal twins, as they do not ...

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

Oct 1, 2015 ... The term “identical twins” is generally used as a synonym for “monozygotic (MZ) twins.” Both terms assume that that the twins developed from ...

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.quora.com/Is-it-possible-to-have-identical-twins-that-are-a-boy-and-a-girl

Theoretically, yes, if the initial embryo was male, it split very early when it was only a few cells big, and the cells which went into one twin had a chromo...