BIOS 222 Lecture Notes - Lecture 15: Sister Chromatids, Helicase, Cytokinesis
Document Summary
Longest phase of interphase, g1, because cell can stay in the stage for years such as neurons and muscle cells at g0. Synth,mitosis, and gap2 is shorter, depends on cell type. Fig 18-3 cells spend most of time at g1. Two new daughter cells by end of mitosis. Cells translate into proteins and help cell function. Sig received by cell to prepare for s phase. Favorable environment to go into synth then so on. Theoretical checkpoints at end of metaphase, going into anaphase, pull away copies of chromosomes. Time where proteins physically check, interact, knowing whether chrom missing, fiber not actually attached to chrom in right place. If things are fine, cell division, anaphase, will finish 2 new daughter cells. If copied everything and have everything attached, check if mech of separation is working. G1 can be variable until some gf/signal tells cell it has to divide because cell is growing or cell next to it needs to divide.
