Abstract
ABSTRACTMacronuclear DNA synthesis normally continues until late in the cell cycle in Paramecium; however, blockage of macronuclear DNA synthesis after 0.72 in the cell cycle does not alter the occurrence or timing of the subsequent cell division. When DNA synthesis is blocked after cells have reached the transition point, macronuclear DNA content at the following division is reduced to about 75% of the normal level. The point at which macronuclear DNA synthesis is no longer required for division corresponds to the beginning of micronuclear mitosis and the early stages of oral morphogenesis.
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