Binary Fission:
• Cell Division in Prokaryotic Cells
• asexual reproduction in which one cell divides
into two identical daughter cells
The Cell
Cycle
How cells divide
to make new cells
Just like people have
phases of development,
Cells have phases too.
In somatic (body)
cells, a parent cell
produces 2
daughter cells.
The purpose of
cell division is for
growth and repair
of tissue.
Three Phases or Stages
1. Interphase
2. Mitosis
3. Cytokinesis
Interphase
Interphase
 DNA and organelles replicate
 Cell spends most of its life in
this stage
Stages of Interphase
G1 (growth)
normal activities – endo & exo
S (synthesis) genetic material is
duplicated so each daughter
cell contains the same
amount of genetic material as
the parent cell
G2 (growth)
preparing for cell division
Mitosis
Nucleus divides
 Duplicated DNA is divided
into two new nuclei

Stages of Mitosis
Prophase
Metaphase
Anaphase
Telophase
Prophase
Prophase
• Nuclear membrane breaks down
• Genetic material (chromatin)
condenses
• Centrioles migrate to opposite
ends of poles (in animal cells)
• Microtubules (spindle fibers)
attach to centrioles
Prophase
Metaphase
Metaphase
• Duplicated chromosomes line
up on the equator of the cell
• Microtubules (spindle fibers)
attach to centromere at
kinetochore
Metaphase
Anaphase
Anaphase
• Duplicated chromosomes
(also called sister
chromotids) separate
• 1 of each pair are pulled
apart toward opposite
poles of the cell
Anaphase
Telophase
Telophase
• New nuclear membranes
form to separate the
genetic material
• Cleavage furrow in animal
cells
• Cell plate in plant cells
Telophase
Mitosis
Cytokinesis
Cytokinesis
• Occurs AFTER telophase
and BEFORE interphase
• Cytoplasm divides
Cytokinesis
Mitosis Animation
What happens when cells divide
at an uncontrollable rate?
CANCER
Causes of Cancer
• Tobacco
• Radiation exposure
• Viral infections (HPV)
• Genetics
Cancer Animation