BIOL 1090 Lecture Notes - Lecture 2: G1 Phase, Sister Chromatids, Centrosome
5 May 2016
School
Department
Course
Professor
Document Summary
Mass of prok. cells = colony euk. cell division = mitosis + cytokinesis. Mitosis organelle & cytoplasmic content are divided more or less equally b/w daughter cells endopl. reticulum & golgi complex are fragmented at the time of division & later reformed in the daughter cells. Cell cycle series of stages (times are avg. for an animal cell) G1 phase = gap 1 phase = growth & metabolism, or recovery from the stage of cell division (large portion - 10hrs) S phase = dna synthesis & chromosome duplication (9hrs) G2 = gap 2 = preparation from mitosis = check phase (4hrs) M phase = 1hr = mitosis (process that distributes chromosomes, or chromosomal pas de deux ) + cytokinesis (cytokin. Cells that are not actively cycling may exit cycle from g1, they enter a state called g0 ( quiescent ). Interphase duplicate chromosomes = sister chromatids joined at centromere by cohesion the centrosome (+ centrioles) is duplicated: mitosis i.
