Cell Division
Dec 28, 2015
Binary FissionSingle Circular chromosome is replicatedCell doubles in sizeCell divides with one copy of chromosome in
cell
Prokaryotic Cell Division
Chromosome = two sections of identical DNA joined by a centromere
Sister Chromatids = 2 identical halves of a chromosome. When separated chromatids = chromsomes
Cell division in Eukaryotes (Vocab)
Cell cycle = series of events that cells go through as they grow and divide
Begins and ends with formation of identical cells
What do cells need to do before they can divide?GrowReplicate DNA
Stages of the Cell Cycle•Two main phases – Interphase and M phase• Interphase is when the cell is not actively
dividing• Longest phase• broken into 3 stages: G1, S, G2
G1 = First growth phaseCell grows and carries out cell functionsCell creates RNA proteins and organellesExtended G1 phase (G0 phase) = no replication
Nerves, roots, stems
Stages of the Cell Cycle Continued
S = SynthesisDNA is replicated, cell now has two copies
DNA
*Each chromosome is copied. The new copy is joined to the old copy. Identical copies = sister chromatids. Together they form a chromosome.
Stages of the Cell Cycle Continued
G2 = Second Growth PhaseCell finishes preparation for divisionProtein RNA and macromolecules are made2x as much DNA in nucleus
Stages of the Cell Cycle Continued
M phase = DivisionDivision of the nucleusFollowed by division of the cytoplasm
(cytokinesis)Two cells are created from 1 cellShortest phase
Stages of the Cell Cycle Continued