Transcript Cell Growth and Division

Cell Growth and Division
Chapter 10
Cell Growth, Division, and
Reproduction
Section 10.1
Limits to Cell Size
• Two main reasons for cell division
– The larger the size, the more demands there are
on DNA.
– Larger cells are less efficient at moving
nutrients/wastes.
Limits to Cell Size
• Information Overload
– Info stored in DNA
– As a cell gets larger,
DNA does not
• DNA may not be able to
serve needs of growing
cell.
Limits to Cell Size
• Exchanging Materials
– Materials enter/leave through cell membrane.
– Rate at which materials used/expelled depends
on…
• Surface area
• Volume
Limits to Size
• Division of the Cell
– Occurs before the cell gets too large.
– Makes two new daughter cells.
– Process called cell division.
• Solves information overload
• Reduces cell volume
Cell Division and Reproduction
• Asexual
– Making genetically
identical offspring to a
single parent.
– Ex: bacteria, many
multicellular organisms.
• Sexual
– More than one parent
– Offspring inherit some
genes from each parent.
– Ex: Most animals/plants
Comparing Asexual and Sexual
Reproduction