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en.wikipedia.org/wiki/Twin

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ... Female-female—sometimes called sororal twins; Male-male twins —no special name; Male–female twins—most common pairing; half of all fraternal ...

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

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

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

Apr 15, 2016 ... Yes! Contradictory to popular belief, identical twins can be male and female. However, it is so very rare that twins having different genders is ...

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

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.

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

Oct 1, 2015 ... But, as explained here, identical twins do not always look exactly the same. And male/female twins certainly don't look identical!

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 ... twins have been born with opposite sexes (one male, one female).

babyandbump.momtastic.com/twins-triplets-multiples/114004-identical-twins-can-opposite-genders.html

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

www.quora.com/How-come-some-identical-twins-are-one-male-and-one-female

I thought identical twins had identical chromosomes. How can this be if one ... How come some identical twins are one male and one female? I thought identical  ...

www.ncbi.nlm.nih.gov/pmc/articles/PMC1012913

Mongoloid twins with 48 chromosomes (AA plus A21XXY). ... of monozygotism in spite of a sexual dimorphism: XY male subject and haploid X neuter subject].

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 ... Babycenter.com not an hour ago that idetical male and female twinsDo exist, ...