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Mitosis
or sex and the somatic cell
Eukaryotes have a fixed number of
chromosomes, the number different for
different species
 Chromosomes exist in pairs
 A somatic cell is a cell that is not
involved in reproduction of a new
organism
 When a cell has a complete set of
chromosomes it said to be in a diploid
condition

Mitosis
(what did the ice fisherman
say to his buddy?)
Mitosis
Is the division of somatic cells in which
the appropriate number of
chromosomes is maintained.
 Cell division consists of interphase,
mitosis and cytokinesis

Interphase
is the time between divisions
G1 phase - characterized by growth of
the cell
 S phase is time of DNA synthesis
 G2 phase characterized by protien
synthesis in preparation of mitosis

Mitosis (look at pages 190 to
199 in your expensive book)
Prophase
 Metaphase
 Anaphase
 Telophase

Prophase

Chromosomes condense, become
visible
Metaphase
Chromosomes line up along the
“equator”
 the entire cell condenses and
chromosomes are more visible than at
any other time

Anaphase
Chromosomes begin to separate into
sister chromatids
 each chromatid is independent of other
 sister chromatids are pulled toward
opposite poles, by now each is a full
fledged chromosome
 anaphase is complete when
chromatides arrive at the poles

Telophase
Final stage of mitosis (whew)
 a nuclear envelope forms around each
set of chromasomes
 nucleoli appear
 mitosis is complete

Cytokinesis
The cytoplasm divides to produce two
daughter cells
 Cytoplasm actually begins during
telophase

In class exercise
Break into groups of 4-6 people
 write a limerick or a country song about
mitosis
 pick a spokesperson to present it
 you have 20 minutes
