Cell cycle ex' 7

1
Cell cycle ex. 7

• Mitosis

2
Cell must divide

• Body cells divide
• allows us to grow
• allows repair
• allows replacement of worn parts
• this process is mitosis

• Sex cells (gametes) also must divide
• gives us the ability to create offspring
• this process is slightly different
• it is called MEIOSIS

3
Interphase

• DNA duplicates
• Duplication of other internal structures
• in humans there are 46 chromosomes in each cells
  (except mature sperm and eggs)

4
Next comes real mitosis

• The cell goes through 4 more steps during this
  type of division
• you end up with 2 identical Daughter Cells
• Remember, this is division of the body cells, not
  the SEX CELLS
• begins karyokinesis

5
Prophase.

• The nuclear membrane begins to disappear
• the chromosomes become visible because they
  shorten and thicken

6
metaphase

• The chromosomes line up on the equatorial plane
• the mitotic spindle attaches to the chromosomes
  at the centromere

7
anaphase

• Chromosomes separate and move to opposite poles
• Cytokinesis begins

8
Telophase

• Cytokinesis-division of the cytoplasm completes
  here
• nuclear membrane reappears
• chromosomes become less visible