Download Mitosis handout (front) - Campbell County Schools

Cell Growth and Division
l. Limits to Cell Growth
A.
Why do cells divide instead of just getting larger?
it places on the
1. The larger a cell becomes, the more
lf the cell grows too large, it will have trouble moving enough
across the
2.
il. Cell division
1. Cell division is the process
& wastes
new
by which cellular material is divided between
cells.
2.
:-> 2 Daughter cells.
The two daughter cells will be identical to
and to the
cell.
3. Each daughter is half the size of the parent cell, but immediately begins growing.
4. A typical human cell has about 2 meters of DNA. Before the cell can divide, all of this DNA
must be
and then the two copies separated so that each daughter cell ends up
with a
set of
pairs
of chromosomes or
total.
5. Humans have
1 Mother Cell
_
lll. Chromosomes During Eukaryotic Cell Division
A. Each cell must first
its
before cell division occurs.
B. Each daughter cell gets a complete copy of
?2
:>
that info..
C. Cell division occurs in two main stages:
1. Mitosis - division of the
2. Cytokinesis - division of the
lV. The Cell Cycle
1,Thecellcycleisaseriesofeventsthatcellsgothroughasthey-&
2.
3.
From time it is formed from a dividing parent cell until its own division into 2 cells.
During the cell cycle:
and it divides to form
The cell
, the cell prepares for
cells.
4. lnterphase
(a) Of the cell cycle, interphase accounts for
of the time.
(b) Nucleus is
and bounded by the
(c) Outside of the nucleus are two
They will begin to move apart as
spindle microtubules grow out of them.
_
V. Mitosis
A. Has 4 Stages
(1)
(2)
(3)
(4)
1. Prophase
Earlv Prophase:
(a) The chromosomes coil and thicken and become
from
one another. The chromosomes are now visible.
(b) The nucleolus
(c) The chromosomes are
throughout their length.
(d) Each half of the double chromosome is a