It's important for everyone to know about these exceptions, before attempting to debate the issue of ‘trans-genders’. Otherwise, you will fall into a ‘gotcha’ trap.
Hermaphrodites are the only exception that really is an exception.
Chimeras have featured in several cop shows, as a plot device. Usually, it involves a serial killer, who gets away with murder, because his DNA does not match the DNA at the crime scene. The surprise ending — the perp has two sets of DNA! I guess it could be considered a trope.