The Cell Cycle a

							      It’s The
circle of cell
         life
    How do cells reproduce and
                         grow?
Why do cells
divide?
To replace other cells that have been
damaged or worn out

To allow multicellular organisms to grow

For asexual reproduction

Because they get too big!
What is MITOSIS?

Mitosis is the process by which the
nucleus of one cell DIVIDES into two
nuclei

Therefore, each cell has the same genetic
material as the original cell

Its like “photocopying” the cell- the two
daughter cells are identical
Genetic
Information
Genetic information is contained in the DNA of
the cell

DNA is found in the thread-like coils called
CHROMATIN when the cell is NOT dividing

When the cell is dividing, the chromatin
condenses (packs into) chromosomes

genes are small sections of chromosomes that
contain the information for a specific cell
function
The big
picture
Human
Chromosomes
The cell cycle
Cell Cycle




The cell
spends the
most amount of
time in
interphase-
growing
Cell Cycle-
Interphase
         During INTERPHASE
         the cell is GROWING
         and preparing to
         reproduce

         The cell’s DNA is being
         copied (replicated)

         The DNA is in the form
         of loosely coiled
         CHROMATIN
Cell Cycle-
Mitosis
Remember! Mitosis is the stages of the cell
cycle in which the nucleus and cell divides

Mitosis is divided into:
  Prophase
  Metaphase
  Anaphase
  Telophase
  Cytokenesis
Cell Cycle




The cell
spends a very
short amount
of time in
mitosis-
dividing
The phases
of mitosis
Early Prophase

        Chromosomes are
        condensed and
        consist of 2 sister
        chromatids

        The nuclear
        membrane begins to
        break down

        Spindle fibers appear
Late Prophase


       The CENTROMERE
       joins each pair of
       sister chromatids to
       the spindle fiber
Metaphase



       Chromosomes line up
       along the middle of
       the cell
Anaphase

       Spindle fibers
       separate sister
       chromatids and pull
       them apart

       Once they have
       separated they are
       individual
       chromosomes
Telophase

       Spindle fibers
       disassemble

       Nuclear envelope
       reforms

       The nuclear envelope
       will become the
       nuclear membrane
Cytokinesis


 In animal cells, cell membrane pinches off
 forming two new separate cells

 In plant cells, cell membrane pinches off and
 a cell wall forms

 The cytoplasm is divided between the two
 cells
Mitosis in
action!
     How am I
      going to
remember this?



Think IPMATC!
    Phase name   mnemonic


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