-Sexual reproduction takes place by conjugation
-Which involves exchange of nuclear material and not fusion of gametes
-Two paramecia called conjugant partially unite by their oral ends
-Their pellicle dissolve
and their cytoplasm become continuous
-The macronuclei divide mitotically into four haploid pronuclei
three of which disintegrate
-The remaining pronucleus divides into a stationary and a migratory nucleus
-The migratory pronucleus of one(A) migrates into another (A)
and fuses with the stationary pronucleus of B (and vice versa)
to for a zygotic nucleus.
-The conjugant now separate
-And the zygotic nucleus of each ex-conjugant result in the formation of four paramecia from each ex-conjugants.