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Slide 2

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· The chromosomes become visible
as long thin threads.
· The chromosomes start to coil up
and become shorter and fatter.
· In animal cells, the centrioles divide
and move to opposite ends of the
· Protein microtubules develop from
each centriole, forming spindle
fibres. Some of these extend from
pole to pole in plant cells there are
no centrioles and the spidle fibres
form independently.…read more

Slide 3

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· Towards the end of
prophase, each chromosome
can be seen to consist of two
chromatids held together by
a centromere.
· At the end of prophase the
nucleolus disappears and the
nuclear envelope breaks
down. The chromosomes
now lie free in the cytoplasm.…read more

Slide 4

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move towards
the equator of
the spindle.
·Here they
themselves to
a spindle fibre
by means of a
centromere.…read more

Slide 5

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· The centromeres holding
each pair of chromatids
together divide.
· The free chromatids move
to poles, centromere first.
This movement results
from the contraction of the
spindle fibres.
· As they shorten they pull
the chromatids apart.…read more

Slide 6

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· The chromatids have now
reached the poles and can be
regarded as distinct
· This final stage of mitosis can
be regarded as the reverse of
· The nuclear envelope forms
around each group of
chromosomes and the
nucleolus reappears. The
chromosomes uncoil to form
diffuse chromatin.
· The cytoplasm divides by a
process called cytokinesis.…read more

Slide 7

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