Yes, it is possible to get an emulator of almost any OS to run on some other OS. Now all you have to do is do a Google search in looking for that emulator, oh, and also be prepared to write a check... because most of the emulators, worst a darn, are not going to be freeware. If a person (or company) has spent a fair bit of time in working on an OS emulator, working out all the kinks and problems they generally want some money for their hard work.
But what is it you are hoping to accomplish? If you are in the belief that the Mac OS is any less buggy (I am not of that belief) then whatever you have running on the PC will not be as bug free as the ''pure version'' (your preferred OS on the correct hardware). It will have the same sort of bug issues of the base platform, plus the possible bugs of that overlaying OS, PLUS the bugs of the emulator.
I have seem emulators come and go. One of the most versatile platforms was the Amiga, which had emulators for all kinds of other OS'es (PC, Mac, various flavors of UNIX, Atari, even old Apple II), which had all the headaches, also.