http://en.wikipedia.org/wiki/Ciliate
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In general the process is as follows but the details may vary between species:
- Compatible mating strains meet and partly fuse.
- The micronuclei undergo meiosis producing four micronuclei per cell.
- Three of these micronuclei disintegrate. The fourth undergoes mitosis.
- The two cells exchange a micronucleus.
- The cells then separate.
- The micronuclei in each cell fuse.
- This is followed by mitosis which occurs three times giving rise to eight micronuclei.
- Four of the new micronuclei transform into macronuclei
- Finally binary fission occurs twice yielding four daughter cells.
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