Download Mitosis

Where do cells come from?
Cell Theory
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All living things are made of cells.
Cells are the basic unit of life.
Cells come from other cells.
Schwann – animal cells 1839
Schleiden – plant cells 1839
Virchow – cell come from pre-existing cells
1855
Where did these animals come
from?
What about these plants?
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This process of division is called
Mitosis. It occurs in multiple
stages or phases. You will learn the
details of this process in high school
biology.
However, today, we are observing cells
that are going through different stages of
the reproductive process called Mitosis.
Normal Cell Activities – DNA in
chromosomes is copied at end of
stage
INTERPHASE
Chromosomes thicken and become
visible. (getting ready to divide)
PROPHASE
Chromosomes line up in middle of
cell (in pairs – sister chromatids)
METAPHASE
Chromatids pull apart – half go to
each side
ANAPHASE
Nuclear membrane forms around
both ends of chromatids.
Cell membrane separates into two
new cells.
TELOPHASE
CYTOKINESIS
Whitefish Mitosis
http://www.biologycorner.com/projects/mitosis/whit
efish_embryo.html
Onion Root Tip Mitosis
http://www.biologycorner.com/projects/mitosis/o
nion_root.html
Summary
Where would you say cells come
from?
How do cells reproduce?
Summary
Where would you say cells come
from? Cells come from other cells.
How do cells reproduce?
Summary
Where would you say cells come
from? Cells come from other cells.
How do cells reproduce?
Cells divide through MITOSIS.