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Mitosis and Meiosis
Higher Biology
Mitosis and Meiosis
• Mitosis:
-division of somatic (body) cells
• Meiosis
-division of gametes (sex cells)
Mitosis
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase
Interphase
• Interesting things happen!
1. Cell preparing to divide
2. Genetic material doubles
Prophase
• Chromosome pair up!
1. Chromosomes thicken and shorten
-become visible
-2 chromatids joined by a centromere
2. Centrioles move to the opposite sides of
the nucleus
3. Nucleolus disappears
4. Nuclear membrane disintegrate
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Metaphase
• Chromosomes meet in the middle!
1. Chromosomes arrange at equator of
cell
2. Become attached to spindle fibres
by centromeres
3. Homologous chromosomes do not
associate
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Anaphase
• Chromosomes get pulled apart
1. Spindle fibres contract pulling
chromatids to the opposite poles of
the cell
Telophase
• Now there are two!
1. Chromosomes uncoil
2. Spindle fibres disintegrate
3. Centrioles replicate
4. Nucleur membrane forms
5. Cell divides
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Nscu 302 wk 2 5
Nscu 302 wk 2 5
Meiosis
• 4 daughter cells produced
• Each daughter cell has half the
chromosomes of the parent
• 2 sets of cell division involved
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