The antonym of the noun 'gender' is genderlessness, a word for the state of having no gender.
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
Opposite gender of Filipino: Filipina
Clot is not gender specific.
Opposite gender of a Filipino: FILIPINA
An emperor is the opposite in gender to an empress.
The opposite gender of giantess is giant.
The opposite gender for Joseph is Josephine.
There isn't an opposite gender of farmer. A farmer can be either a male or a female.
The opposite of dairymaid is dairyman.
gentlewoman....
granddaughter
The opposite gender of lad is lass.