CELL CYCLE AND CELL DIVIS
INTRODUCTION
All cells reproduce by dividing Into two,
Growth and reproduction are characteristics
with each parental cell giving rise to two
of cells, indeed of all living organisms.
daughter cells each time they divide
CELL CYCLE
S I
It is sequence of events Cell growth results in Cell growth (in terms of
Y
by which a cell duplicates disturbing the ratio between cytoplasmic increase) is
its genome, synthesises the the nucleus and cytoplasm. a continuous process
H
other constituents of the cell It therefore becomes
P
& eventually divides into essential for the cell to
two daughter cells divide to restore the
nucleo-cytoplasmic
ratio
A L L
W
PHASES OF
CELL CYCLE
INTERPHASE
• Called resting phase • Actual cell division phas
• Cell is preparing for division by undergoing •Starts with nuclear divisi
both cell growth & DNA replication in an orderly manner. usually ends with divisio
• It lasts more than 95% of the duration of cell cycle (cytokinesis)
INTERPHASE
Divided further into three phases
INTRODUCTION
All cells reproduce by dividing Into two,
Growth and reproduction are characteristics
with each parental cell giving rise to two
of cells, indeed of all living organisms.
daughter cells each time they divide
CELL CYCLE
S I
It is sequence of events Cell growth results in Cell growth (in terms of
Y
by which a cell duplicates disturbing the ratio between cytoplasmic increase) is
its genome, synthesises the the nucleus and cytoplasm. a continuous process
H
other constituents of the cell It therefore becomes
P
& eventually divides into essential for the cell to
two daughter cells divide to restore the
nucleo-cytoplasmic
ratio
A L L
W
PHASES OF
CELL CYCLE
INTERPHASE
• Called resting phase • Actual cell division phas
• Cell is preparing for division by undergoing •Starts with nuclear divisi
both cell growth & DNA replication in an orderly manner. usually ends with divisio
• It lasts more than 95% of the duration of cell cycle (cytokinesis)
INTERPHASE
Divided further into three phases
