What is Mitosis? • Mitosis : Cell division involving somatic (non- sex) cells • Involves only diploid cells – 2n • Form of asexual • Form of asexual reproduction for some life (bacteria & protista fungi) (bacteria & protista, fungi) • End Result : Two genetically identical genetically identical “daughter cells” The Cell Cycle • Defined: Repeating set of events in the life of a cell • Defined : Repeating set of events in the life of a cell • 1) Interphase G1 S G2 – G1, S, G2 • 2) Prophase • 3) Metaphase • 3) Metaphase • 4) Anaphase 5)T l h • 5) Telophase Remember: The cell won’t continue on to the next stage unless the cell is large enough and everything has been copied properly. Interphase • Divided into 3 Stages: • G1 Stage • G1 Stage – Normal function performed – Cell growth – Organelles replicated • S Stage • S Stage – Chromatin (DNA strands) duplicated • G2 Stage – Cell growth N lf ti – Normal function performed Prophase •1 st Mitosis Stage • Chromatin (DNA strands) coils into chromosomes • Nucleus dissolves Nucleus dissolves spilling the chromosomes chromosomes • Spindle fibers f form Metaphase •2 nd stage of mitosis mitosis • Spindle fibers attach to attach to centromeres of each chromosome • Spindle fibers pull the chromosomes to the cell’s equator