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Oh give me a clone, just a clone of my own
With its Y chromosome changed to an X
And when we're alone, just me and my clone
We'll both think of nothing but sex
- Isaac Asimov

While clones and most other sorts of sci-fi duplicates are identical to the original character and, by definition, the same sex, exceptions do exist. The idea dates at least from Time Enough for Love by Robert Heinlein, where the opposite sex clones become sexual partners of the original; nowadays the trope is more used as a quick way of producing a Distaff Counterpart rather than for titillation. Merely being of the opposite sex of his or her original greatly increases the chance of the clone surviving the denouement and showing up in a future story.

Biologically, this is somewhat plausible for male-to-female cloning, because a male has an X-chromosome that can be doubled to produce a female clone (as in Asimov's poem and Heinlein's novel). For female-to-male cloning, the Y chromosome would have to either come from another subject, and thus one would not have a pure clone, or be formed from one of the X-chromosomes.

See Cloning Blues. Compare Distaff Counterpart, and Screw Yourself.


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