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Meiosis
Meiosis
• The process of Meiosis has TWO divisions
• In the end of the FIRST division, one cell
divides into two
• In the ...
Gamete Cells
• The second division in meiosis produces
gamete cells
• Gamete cells are sex cells
• These cells have HALF o...
Haploid/Diploid
• The original cell at the beginning of Meiosis is
a diploid cell
• Di- means TWO
• Diploid cells have 2 s...
Meiosis – FIRST DIVISION
• In phase 1 (prophase 1) – chromosomes (each
consist of 2 chromatids) condense
– crossing over c...
http://www-bcf.usc.edu/~forsburg/meiosis.html
Meiosis – SECOND DIVISION
• In phase 1 (prophase 2) – chromosomes
condense
• In phase 2 (metaphase 2) – chromosomes line
u...
Adapted from http://www-bcf.usc.edu/~forsburg/meiosis.html
Taken from http://www.infovisual.info/01/021_en.html
Take a look at the both stages together
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Meiosis

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Meiosis

  1. 1. Meiosis
  2. 2. Meiosis • The process of Meiosis has TWO divisions • In the end of the FIRST division, one cell divides into two • In the SECOND division, two cells divide into four • So you start with 1 cell and the end result is 4 cells!
  3. 3. Gamete Cells • The second division in meiosis produces gamete cells • Gamete cells are sex cells • These cells have HALF of the number of chromosomes the original cell had
  4. 4. Haploid/Diploid • The original cell at the beginning of Meiosis is a diploid cell • Di- means TWO • Diploid cells have 2 sets of chromosomes • Haploid cells only have 1 set • The result of meiosis is 4 HAPLOID CELLS • These haploid cells are used in reproduction
  5. 5. Meiosis – FIRST DIVISION • In phase 1 (prophase 1) – chromosomes (each consist of 2 chromatids) condense – crossing over can occur • In phase 2 (metaphase 1) – homologous chromosomes align in the center of the cell • In phase 3 (anaphase 1) – chromosomes separate with sister chromatids still together • In phase 4 (telophase 1) – cell pinches into two cells each containing 1 chromosome of the homologous pair
  6. 6. http://www-bcf.usc.edu/~forsburg/meiosis.html
  7. 7. Meiosis – SECOND DIVISION • In phase 1 (prophase 2) – chromosomes condense • In phase 2 (metaphase 2) – chromosomes line up in the center of the cell • In phase 3 (anaphase 2) – sister chromatids separate and move to opposite ends of the cells • In phase 4 (telophase 2) – two cells pinch into 4 cells
  8. 8. Adapted from http://www-bcf.usc.edu/~forsburg/meiosis.html
  9. 9. Taken from http://www.infovisual.info/01/021_en.html Take a look at the both stages together

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