mitosis and meiosis
DESCRIPTION
Cell DivisionTRANSCRIPT
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Mitosis and Meiosis
By Mahesh Mahendrakar MSc,MPhil,(PhD)
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Mitosis and Meiosis
• Mitosis:-division of somatic (body) cells
• Meiosis-division of gametes (sex cells)
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Mitosis
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase
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Interphase
• Interesting things happen!1. Cell preparing to divide2. Genetic material doubles
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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 disappears4. 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 apart1. Spindle fibres contract pulling
chromatids to the opposite poles of the cell
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Telophase
• Now there are two!1. Chromosomes uncoil2. Spindle fibres disintegrate3. Centrioles replicate4. Nucleur membrane forms5. Cell divides
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Meiosis
• 4 daughter cells produced• Each daughter cell has half the
chromosomes of the parent• 2 sets of cell division involved