Margarita Lucio

1
Mitosis
VS.
Meiosis

• Margarita Lucio
• 5th period
• Feb.10th, 2003

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Bibliography

• www.google.com
• www.AJKids.com
• http//www.uwinnipeg.ca/simmons/meiosis/sld016.ht
  m
• www.acsamman.edu.jo/ms/science/7/meiosis.html

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What is Mitosis?

• Mitosis is a process that takes place in the
  nucleus of a dividing cell and that results in
  the formation of two new nuclei with the same
  number of chromosomes as the parent nucleus

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Phases of Mitosis

• The phases are prophase, prometaphase, metaphase,
  anaphase, and telophase.

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Prophase

• The chromosomes become condensed and key proteins
  begin to bind the kinetochores, preparing for
  spindle attachment.

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Prometaphase

• The mitotic spindle is formed and the chromosomes
  attach to microtubules in the spindle via their
  kinetochores.

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Metaphase

• All of the chromosomes are attached to
  microtubules via their kinetochores, and aligned
  at the metaphase plate.

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Anaphase

• The sister chromatics separate and are moved
  toward the poles of the spindle. The chromosomal
  separation and movement toward the poles is
  called Anaphase A. The spindle poles separate as
  well, which is anaphase B. Midzone complex
  formation also occurs in the anaphase.

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Telophase

• The mother cell is physically divided into two
  daughter cells by cytokinesis.

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Mitosis occurs...

• It occurs everywhere in your body, except sex
  cells.

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What is Meiosis?

• the process by which the number of chromosomes in
  a cell that produces sex cells is reduced to one
  half

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Phases of Meiosis

• Meiosis only occurs in the process of
  gametogenesis, it is when the sex cell is being
  formed.In fertilization, meiosis is needed to
  prevent the doubling of the chromosome number in
  each successive generation. The phases are
  interphase, prophase I, metaphase I, anaphase I,
  telophase I, prophase II, metaphase II, anaphase
  II, and telophase II.

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Prophase I

• Prophase is the phase in which the cell is not
  reproducing.

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Metaphase I

• in metaphase 1 the nuclear membrane disappears
  and the chromosomes line up along the inside of
  the cell

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Anaphase I

• Anaphase 1 two chromosomes go to each side of the
  cell and the cell starts to split.

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Meiosis occurs....

• Meiosis occurs in the ovary and testis

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Difference between the two processes
of cell division

• Yes, there is a difference between the two. There
  is more phases on meiosis than mitosis.