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OCR Biology Module 1 unit 1…read more

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G1 Biosynthesis,
replicated, proteins
made, overall
increase in the size
of the cell
S DNA replicates
Proof reading
enzymes move along
the DNA strands to
check copying has
been done properly
G2 Further growth…read more

Slide 3

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·The chromosomes shorten
and thicken
·The nuclear envelope breaks
down and disappears
·An organelle called the
Centriole divides into two
·Each Centriole moves to
opposite ends of the cell to
form the spindle…read more

Slide 4

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·The chromosomes move to the
central region of the spindle.
·Each chromosome becomes
attached to a spindle thread by
its Centromere.…read more

Slide 5

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·The Centromere holding together
the replicated sister chromatids
splits .
·At this point each "sister"
effectively becomes an individual
·The spindle fibres shorten pulling
the sister chromatids further and
further away from each other and
towards the poles.
·The assume a V shape because the
Centromere attached to the spindle
fibre leads.…read more

Slide 6

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Telophase and Cytokinesis
·As the chromosomes reach the
poles of the cell a new nuclear
envelope forms around each set
·The spindle breaks down and
·The chromosomes uncoil so you
can no longer see them under a
·The whole cell now splits to form
two new cells each containing a
full se of chromosomes original to
those in the parents cell
·The splitting in two is called
Cytokinesis…read more

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