Name: ______Date: ______Period: ______Score: ______

5.5Cell Cycle and 5.6 Mitosis

Why do cells reproduce? ______in size, ______wounds, and ______>

Gametes – ______cells; sperm(male) and ovum (female)

Somatic Cells – ______cells (all cells but sex cells)

Cell Cycle –___ steps, ______, ______, ______; to cause a cell to make an ______of ______

The 3 parts of the cell cycle are:

  • Interphase
  • G1: ______, expect DNA, are ______, like organelles
  • S Phase: the ______(______) is ______in the cell
  • G2: the cell ______for ______

Mitosis -the process by which the nucleus divides in ______, producing ______that are identical to the nucleus of the parent cell

Cytokinesis - when the cell physically splits in half and each new cell has identical DNA to the original cell - ______

CFU #1: During which phase of the cell cycle are chromosomes duplicated?
CFU #2: During which phase of the cell cycle are organelles duplicated?
Phases of Mitosis
/ “______” The ______disappears.
DNA condenses to make ______.
/ “______” The chromosomes ______at the ______of the cell.
/ “______” The chromosomes ______, moving to opposite sides of the cell
/ “______” The chromosomes spread back out and the______begins to ______.

Independent Practice

Phase / Description (what happens in your own words?) 1-3
Interphase / G1
S
G2
  1. If an organism has 28 chromosomes in each of its body cells, how many chromosomes will be in a new skin cell after mitosis occurs? (Remember its identical for mitosis)
  2. 28
  3. 56

What are the stages of the cell cycle?5. ______

6. ______

7. ______

8. Which stage copies DNA? ______9. Which stage copies the organelles? ______

12.

  1. Which activity most directly involves the process represented in the diagram below?
  1. A white blood cell eating a bacterial cell
  2. A bacterium dividing
  3. An animal undergoing growth
  4. A virus reproducing

23. Most of the cells from the diagram on the last questions are most likely undergoing which phase of the cell cycle? ______

1