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Mitosis and the Cell Cycle. Cell reproduction. Today’s Objectives. The student will be able to identify the phases of the cell cycle and mitotic stages by description and or graphic representation. The student will be able to identify mitotic stages by photomicrograph. Some Definitions.

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today s objectives
Today’s Objectives
  • The student will be able to identify the phases of the cell cycle and mitotic stages by description and or graphic representation.
  • The student will be able to identify mitotic stages by photomicrograph.
some definitions
Some Definitions
  • Somatic Cells – body cells
    • Produced through mitosis
    • Has 46 chromosomes (23 pairs)
  • Homolog – each member of a chromosome pair
  • Diploid (2n) – total of 46 chromosomes in people – zygote & somatic cells
  • Haploid (n) – total of 23 chromosomes in people, gametes (sperm & egg)
the cell cycle
The Cell Cycle
  • The sequence of growth and division of a cell.
  • 95% of cell cycle in interphase
  • 5% of cell cycle in mitosis
interphase
Interphase
  • Growth Stage 1 (G1) – metabolic activity of the cell
  • Synthesis Stage (S) – metabolic activity of the cell, replication of DNA
  • Growth Stage 2 (G2) – metabolic activity of the cell, prepare for division
mitosis
Mitosis
  • Happens in all cells
  • Cell division process
  • 5 major stages
prophase
Prophase
  • Nuclear envelope disappears
  • Chromosomes condense – can see sister chromatids

and centromere

  • Spindle forms
metaphase
Metaphase
  • Chromosomes move to the equator of spindle
  • Each chromatid is attached to spindle with centromere
anaphase
Anaphase
  • Centromeres split
  • Sister chromatids are pulled apart to opposite poles of the cell
  • Each chromatid is now a separate chromosome
telophase
Telophase
  • Nuclear envelopes (2) reform
  • Chromosomes begin to uncoil
cytokinesis
Cytokinesis
  • Cytoplasm divides
  • Two new daughter cellsare now separate