Mitosis

By: Megan Walkenhorst

What is Mitosis?

Mitosis is cell division which results in 2 identical daughter cells that are diploid.


Diploid:cells that have 2 copies of each chromosome or a full set of genetic info (DNA).

What is the purpose of Mitosis?

  1. growth
  2. repair
  3. maintenance

Stages of Mitosis

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Interphase

  • chromosomes are replicated (# doubles)
  • chromosomes appear as threadlike coils (chromatin) at the start
  • each chromosome and its copy (sister chromosome) change to sister chromatids at the end of this phase
  • the nucleolus and the nuclear envelope are distinct
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Prophase

  • mitosis begins (cell begins to divide)
  • centrioles (or poles) appear and begin to move to opposite ends of a cell
  • spindle fibers form between the poles
  • the chromosomes appear condensed
  • the nuclear envelope isn't visible
  • nuclear membrane dissolves
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Metaphase

  • chromosomes are lined up in the center of the cell
  • chromotids (pairs of chromosomes) attach to the spindle fibers
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Anaphase

  • chromosomes have separated
  • chromatids (pairs of chromosomes) separate and begin to move to opposite ends of the cell
  • cytokinesis begins
Cytokinesis is the division of cytoplasm
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Telophase

  • chromosomes are at the poles
  • nuclear envelope is reforming
  • cytoplasm may be dividing
  • spindle fibers dissolve
  • chromosomes unwind to reform chromatin; cell reenters interphase
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Cytokinesis

  • cell membrane moves inward to create two daughter cells
  • each daughter cell has its own nucleous with identical chromosomes

Resources

*All pictures found at the same website