Mitosis
Prokaryotic
cells divide
by binary
fission
Eukaryotic cells
divide b mitosis=2
daughter cells and
meiosis= 4 unique
daughter cells
Important For Growth
Repair tissues
Asexual reproduction
(1) Interpase
longest stage
Cell
preparin
g to
divide
DNA
replicated
No change in appereance
to cell + chromosomes not
yet visible
Chromosom
es and
Mitosis Eukaryotic
chromosomes
= linear
molecules
During interpase
each chromosome
is duplicated
Essential as
each daughter
cell needs one
copy of each
chromosome
Two copies
of each
chromosome
are joined at
centromere
(2) Prophase
Chromosomes 'condense'
by coiling themselves
tightly, become visable
Chromosomes
now clearly
seen to consist
of two sister
chromatids
joined at the
centromere
End of prophase
Nuclear
envelope
breaks down
Centrio
les
begin
to
opposit
e ends
of the
cell
Spindle
fibres
begin
to form
betwee
n the
centriol
es
(3) Metaphase
Chromosomes
line up, middle
of cell
Spindle fibres fully
formed and extend
from centrioles at
either end of the cell
to the chromosomes
Part of
chromosome
these fibres are
attached to is
called the
CENTOMERE
(3) Anaphase
SISTER
CHROMATIDS,
seperated out, star to
move towards
CENTRIOLES
SPINDLE FIBRES
CONTRACT and pull
chromatids towards
the centrioles
(4) Telophase
Seperated
chromosomes
arrive at the
poles of the cell
Chromosome
s start to
unwind
NUCLEAR
MEMBRANE
starts to
reappear
(5) Cytokinesis
Cytopl
asm
betwe
en the
two
cells
splits
to form
the
daught
er
cells
