The antonym of the noun 'gender' is genderlessness, a word for the state of having no gender.
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It is to attract members of the opposite gender, for mating.
Fraternal twins can be the same sex or opposite sexes. It doesn't matter.
Yes, it's possible for a mutation in the chromosome to produce otherwise-identical twins with opposite genders. But generally no, identical twins have the same gender. (but fraternal twins have different genders just as often as any siblings)
The opposite (antonym) of opposite is same.
opposite of opposite to opposite from
Doctor is a neuter gender
Clot is not gender specific.
The opposite gender of fraternity is sorority.
An emperor is the opposite in gender to an empress.
Opposite gender of Filipino: Filipina
The opposite gender to "negro" is "negra" in Spanish, which translates to "black" and "black woman" respectively.
The opposite gender is girl.
The opposite gender of giantess is giant.
The opposite of dairymaid is dairyman.
Parrot
A Printe is the opposite gender of Printecess
Cock's opposite gender is hen.