CELL DIVISION Binary fission􀁠prokaryotes (bacteria) 􀁡Mitosis & Cytokinesis􀁠division of cells 􀁡Meiosis􀁠division to produce gametes (sex cells)

Cycle, Stages Eukaryotes 􀁡Interphase􀁠G1􀁠S􀁠G2 􀁡Mitotic Phase (M) 􀁠Mitosis (prophase, metaphase, anaphase, telophase) 􀁠Cytokinesis

Overview: 2n = two 2n Separate sister chromatids 2n (diploid) gives rise to 2n (diploid) and 2n (diploid

Interphase Interphase 􀁡G1 : first growth phase􀁠cytosol increase 􀁠 organelle division, 􀁡S : synthesis􀁠DNA replication 􀁡G2 : second growth phase􀁠microtubular assembly

Mitotic Phase (M Mitotic Phase (M) 􀁡Mitosis : division of DNA (precise) prophase,􀁠metaphase,􀁠anaphase, 􀁠telophase 􀁡cytokinesis : division of cytoplasm (rough

Comparison of Mitosis Animal􀁡centrioles􀁡astral rays􀁡cleavage furrow Plant􀁡no centrioles􀁡no astral rays􀁡cell plate

Mitosis Exercises Mitosis Exercises 􀁡Chromosome replication 􀁠 answer questions 􀁡Slides; find interphase, mitosis, cytokinesis 􀁠whitefish blastula - animal 􀁠onion root tip - plant 􀁡Models of Mitosis, examine

Meiosis Meiosis 􀁡division of DNA to produce gametes that are haploid (1n) 􀁡two divisions:􀁠Meiosis I􀁠Meiosis II 􀁡fertilization restores diploid number

Overview: 2n = four 1n Overview: 2n = four 1n ,2n gives 1n and 1n Meosis I: separate homologues Meosis II: separate sister chromatids 1n gives 1n and 1n

Sequence Sequence Interphase I * Meiosis I * Meiosis II 􀁠prophase I - prophase II 􀁠metaphase I - metaphase II 􀁠anaphase I - anaphase II 􀁠telophase I - telophase II Cytokinesis Cytokinesis

Meiosis Exercises Models of Meiosis, examine 􀁡Pop beads exercise

Mitosis: metaphase In the cell you have: In metaphase the centromere of each chromosome lines up at the equator. equator In the cell you have: -2 chromosomes (replicated chromosomes), one red and one yellow -2 centromeres, one red and one yellow Metaphase