BIOLOGY 1A06 ASSIGNMENT HYPERCELL CELL DIVISION EDWIN MUJICA LAB SECTION # 18 LAB DAY: FRIDAY JANUARY 13, 1997 1. Where are the checkpoints in the cell division cycle and what are they called?         The cell division cycle consists of the reproduction of a pair of two daughter cells that are genetically identical. For this to occur, DNA must be duplicated and its products segregated into the nuclear spaces of the two daughter cells. The cell cycle has four phases: 1. S …showed first 75 words of 1258 total…

…showed last 75 words of 1258 total…and therefore cannot continue cell division. This occurs when conditions of development control prevent the cell division cycle from passing the G1 checkpoint. The cell will stay in a GO state, which means that the cell for the moment is destined to exist but not divide. In order for the cell to return to the cell division cycle, the quiescent cell must receive some mitogenic stimulus, and then it must synthesize the necessary controlling proteins.