Planctonic organisms were collected by sampling from pond water with a sterile glass container, which was immersed and held underwater for at least5 minutes. The container was closed tightly before being transported to the laboratory. The wet mount prepared from the pond water sample shows two Paramecium cells joinedat their oral grooves undergoing conjugation. During conjugation, the exchange of DNA occurs after a series of mitotic and meiotic divisions of micronuclei.
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