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Mitosis Lab

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Mitosis Lab

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Mitosis Lab

  1. 1. Cell division: Mitosis • Necessary process • Results in identical cells • Simple, single celled organisms use for reproduction • More advanced, multi-celled organisms use for cell replacement and growth – Occurs in somatic cells, body cells – Diploid: two copies of each chromosome
  2. 2. Cell division: Meiosis • Reductive division • Results in genetically unique cells • Used by sexual multicellular organisms to produce gametes – Haploid: one copy of each chromosome – Occurs in specialized germ cells
  3. 3. Chromosome • Single, long piece of DNA wrapped around proteins • The number of chromosomes differs between organisms
  4. 4. Phases of the Cell Cycle • Interphase – Time of normal cell activities – Longest phase – DNA replication occurs • Mitosis/Meiosis – Time of nuclear division • Cytokinesis – Time of cytoplasm division
  5. 5. Duplicated chromosome: Sister Chromatids • Two copies remain attached at the centromere • Each copy is a chromatid • Together they make up one duplicated chromosome • Split during nuclear division
  6. 6. Interphase • Longest part of cycle • Three stages – G1: cell grows and functions normally – S: DNA is copied – G2: cell prepares to divide
  7. 7. Cytokinesis • Division of the cytoplasm • Animal cells: cleavage furrow • Plant cells: cell plate formation
  8. 8. Today’s Mitosis 1. Look at Mitosis models 2. Observe whitefish blastula cells under microscope (animal cell mitosis) 3. Sketch each stage of mitosis observed in onion root tip cells (plant cell mitosis)
  9. 9. Today’s Mitosis 1. Look at Mitosis models 2. Observe whitefish blastula cells under microscope (animal cell mitosis) 3. Sketch each stage of mitosis observed in onion root tip cells (plant cell mitosis)

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