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The Cell Cycle. An ordered set of events, culminating in cell growth and division into two daughter cells. Essential Question. What are cells made of? What are the functions of cell division? What happens during the cell cycle?. Page 388.

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the cell cycle

The Cell Cycle

An ordered set of events, culminating in cell growth and division into two daughter cells.

essential question
Essential Question

What are cells made of?

What are the functions of cell division?

What happens during the cell cycle?

what are the functions of cell division
What are the functions of cell division?
  • Cell division allows organisms to
  • Grow
  • Repair
  • reproduce
g1 phase interphase
G1 phase:Interphase
    • The formation of cells takes energy!
    • The time needed by the new cells to replenish their energy causes a "gap".
  • After cell energy reserves are restored, the cells begin to grow.
  • This is the longest phase of the cell cycle.
s phase
S phase

Synthesis means to make.

After a period of growth, each cell\'s original DNA is duplicated in the process of replication.

g2 phase
G2 phase

The replication of DNA also takes a lot of energy!

The time taken by a cell to build up its energy reserves produces a second "gap".

mitosis
Mitosis
  • The process by which the DNA is divided into two identical sets before the cell divides.
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
  • Cytokinesis
prophase
Prophase
  • Chromatin coils to form chromosomes, nuclear membrane disappears, and centrioles prepare to move to opposite sides of the cell.
metaphase
Metaphase
  • Fibers move the chromosomes to the equator (middle) of the cell.
anaphase
Anaphase
  • The centromere of each pair of chromatids divides, separate and are pushed to opposite poles (apart) of the cell by the spindle fibers.
telophase
Telophase
  • All spindle fibers disappear, chromatids unwind and stretch as a nuclear membrane forms around each mass of chromatin.
cytokinesis
Cytokinesis:

Cytokinesis is the division of the cytoplasm of a parent cell.

The cell pinches together roughly in the center.

cancer
Cancer

Cancer is a disease of the cell cycle. Some of the body’s cells divide uncontrollably and tumors form.

chemical signals tell a cell when to start and stop dividing
Chemical Signals tell a cell when to start and stop dividing.

(Target cells animation: click on go sign)

neighboring cells communicate with dividing cells to regulate their growth also
Neighboring cells communicate with dividing cells to regulate their growth also.

(Normal contact inhibition animation: click on petri dish)

slide33

Treating Cancers

Cancer treatments include drugs that can stop cancer cells from dividing.

slide34

5?

New cells

1?

2?

3?

4?

home learning
Home Learning

“Cell” Phone- 4/4

Vocabulary Cards-4/5

Vocabulary Quiz -4/5

Cell Coloring Study Guide- 4/5

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