Mitosis
Miss Wineinger
Review
• What do genes code for?
• How many chromosomes do humans have?
• Chromosomes are made of _________ and
_________.
• Are your body cells haploid (1N) or diploid
(2N)?
Mitosis
• 5 phases
•
•
•
•
•
Interphase
Prophase
Metaphase
Anaphase
Telophase
• IPMAT 
1. Interphase
• Centrosomes and
chromatids replicate
inside the cell
• All the chromatid is
INSIDE the nucleus
• Centrosomes are
outside the nucleus
2. Prophase
• Nuclear envelope
disintegrates
• Chromatin coils around
the protein to make
tightly wound
chromosomes
• Spindle fibers start
from centrosomes and
start to “reach” for
chromatids
3. Metaphase
• Replicated
chromosomes line up
in the center of the cell
• Spindle fibers from the
centrosomes “grab”
chromosomes
• Remember:
Metaphase = middle
4. Anaphase
• Sister chromatids are
cleaved and become
daughter
chromosomes
• Spindle fibers shorten
• Remember:
Anaphase = apart
5. Telophase
• The last phase!
• Spindle fibers
disappear
• Nuclear membrane
forms around
chromosomes
• Remember:
Telophase = The End
Cytokinesis
• NOT a step in mitosis
• “cyto-” means ______
• “-kinesis” means
________________
• The two new, identical
cells split
• Chromosomes unwind
back into chromatin
Why?
• Why do our cells undergo mitosis?
Why?
• Why do our cells undergo mitosis?
• GROWTH AND TISSUE REPAIR!
• What is one way to remember the phases of
mitosis?
• IPMAT!!
Mitosis Animation
• http://www.youtube.com/watch?v=-G-3BDlnK58