Lesson Overview
Cell Growth, Division, and Reproduction
Lesson Overview
10.1 Cell Growth, Division,
and Reproduction
Lesson Overview
Cell Growth, Division, and Reproduction
Question #1
Why is a cell’s growth limited?
DNA
As a cell increases in size, its DNA does not – the need for
materials to be built is too great for the ability of the DNA to
copy its instructions
Exchanging materials
Ratio of surface area to volume – as the cell increases in
size, the volume increases faster than the surface area
This means the cell needs more nutrients and to get rid of
more waste than the cell membrane can handle
Lesson Overview
Cell Growth, Division, and Reproduction
Question #2
Data Table
Size of Cube
(cm)
Surface Area
(square cm)
Volume
(cubic cm)
1
6
1
2
24
8
3
54
27
4
96
64
5
150
125
6
216
216
7
294
343
Cell Growth, Division, and Reproduction
Lesson Overview
Question #2
Graph
Surface Area vs. Volume
Suface Area (square cm) and
Volume (cubic cm)
400
350
300
250
200
Surface Area
Volume
150
100
50
0
0
2
4
Size of Cube (cm)
6
8
Lesson Overview
Cell Growth, Division, and Reproduction
Question #3
Graph from #2 = The Cell
As the size of the cube increases, the volume increases faster
than the surface area
The slope for the volume line is higher than the slope for
the surface area line
The cell membrane (surface area) could not keep up with the
demands of the cell for nutrients and to get rid of waste
(cell volume)
Lesson Overview
Cell Growth, Division, and Reproduction
Question #4
Why is cell division important?
Cell division solves the problem of information overload
because each daughter cell gets one complete copy of
genetic information
Cell division also solves the problem of increasing size by
reducing cell volume – this allows for the efficient exchange
of materials within a cell
Lesson Overview
Cell Growth, Division, and Reproduction
Question #5
What is asexual reproduction?
The production of genetically
identical offspring from a
single parent
One example is cell
division in bacteria
(binary fission)
Another example is
budding in hydra (buds
that grow and then
break off)
Binary Fission in
Bacteria
Budding in Hydra
Lesson Overview
Cell Growth, Division, and Reproduction
Question #6
Advantages and disadvantages of asexual reproduction
Advantages
Ability to reproduce very quickly when conditions are
favorable
Organisms will use the same resources (which is plentiful)
during favorable conditions
Disadvantages
The species lacks genetic diversity
When conditions change, the species’ population will drop
quickly
Lesson Overview
Cell Growth, Division, and Reproduction
Question #7
What is sexual reproduction?
Involves the fusion of two separate parent cells
Parents have special reproductive cells that fuse during
sexual reproduction
The offspring will inherit some of their genetic information from
each parent
Lesson Overview
Cell Growth, Division, and Reproduction
Question #8
Advantages and disadvantages of sexual reproduction
Advantages
Takes longer (which can be an advantage for species that
live in environments that change)
Increases genetic diversity
Disadvantages
The process of finding a mate and the growth and
development of offspring requires more time