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Unformatted text preview: ore will not enter S phase if they recieve a go ahed signal at the g1
checkpoint...some cells never enter the s phase and stay at a G0 phase.(exiting the cell cycle and entering into this nondividing state) Stop and Go SIgnals: INternal/External Checkpoint Signals - Many internal signals send molecular signals that delay anaphase - Some extrnal signals are growth factors (recall cell communication) , proteins released by certain cells that stimulate other cells to divide - LOSS of cell cycle controls that is evident in cancer cells... cancer cells rapidly divide and disregard the cell cycle - Cancer Cells tend to grow and divide AS IF there is a signal that gives them the go ahead to divide, although that may not actually have that signal THINGS TO KNOW * Be able to list phases of cell cycle and describe them * List phases of mitosis and each phase * Draw and describe mitotic spindle, centrosomes, kinetochore, and asters * Compare cytokinesis in animals vs plants * Binary Fission Life Cycles and Variation - Living organism are distinguised by their ability to reproduce their own kind - Genetics is the scientiﬁc study of heredity and variation - HEREDITY: Transmission of traits from one generation to the next - VARIATION: Demonstrated by the difference in appearance that offspring shows from parents and siblings - Offspring acquire genes from parents by inheriting chromosomes - We do not inherit physical traits, rather we inherit the genetic traits from our parents - Ex....
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