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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 ... Female-femaleā€” sometimes called sororal twins; Male-male twinsā€”no special name; Maleā€“ female ...

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

Oct 23, 2017 ... Learn the difference between fraternal and identical twins and how it ... The result is either two male twins, two female twins, or one male and ...

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

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

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!

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.

www.twinsuk.co.uk/twinstips/4/140/twin-pregnancy--multiple-births/types-of-twins--identical-fraternal--unusual-twinning

However. it is only the female that has any influence on the chances of having fraternal twins as the male cannot make her release more than one ovum.

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.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-twins-or-fraternal-twins.html

See photos and learn about identical vs fraternal twins. ... Twins that are male and female and/or have different blood types can easily be determined as fraternal ...