Transcript O: You will be able to explain Mitosis.

O: You will be able to explain
Mitosis.
Do Now: Explain how you think
cells make more cells.
Mitosis
• Mitosis is the process of cell division
where one parent cell divides in half to
produce 2 identical daughter cells.
• Mitosis is known as the cell cycle.
• The cells winds up being two cells that are
exactly the same as the first one.
• Why could this be a problem?
How can it split?
• Cells contain chromosomes.
• Chromosomes are structures located in
the nucleus containing DNA.
• The amount of chromosomes determines
what the organism is.
• A human has 46 chromosomes.
There are five stages of Mitosis
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Interphase
Prophase
Metaphase
Anophase
Telophase
Interphase
• Interphase is the longest phase of the cell
cycle.
• During it the cells grows and performs its
normal job. This is most of the cell’s life.
• The nucleus breaks down into
chromosomes.
• At the end of Interphase the chromosomes
duplicate.
Prophase
• During Prophase the chromosomes pair
up with their “twin”
• The centrioles move to opposite ends of
the cell.
Metaphase
• During Metaphase chromosome line up in
the middle of the cell.
• The centrioles send spindle fibers that
attach to the chromosomes.
Homework
• There are two steps left. What do you
think happens in the next two steps?
• If a human has 46 chromosomes, where
do you think they got them from?
• Why does interphase take up over 95% of
a cell’s cycle?
Anaphase
• Spindle fibers pull apart the chromosomes
and the chromotids move to opposite ends
of the cell.
Telophase
• The cell membrane or cell wall for a plant,
starts to pinch together to create 2 new
cells.
• The nucleus begins to reform.