1. Cell Growth and Division
Chapter 10
Cell Growth and Division

3. Limits to Cell Size Too many demands on the DNA
- DNA info builds molecules for growth
- As cell grows, DNA does not
Less efficient in moving nutrients in and wastes out
- Surface Area to Volume ratio limits transport

4. As surface area increases, volume ______ _______.
When cell grows to a certain size, it divides
Cell Division  2 new daughter cells form
Before division, cell must copy DNA

5. Asexual Reproduction
= production of genetically identical offspring from one parent
Bacteria, hydra, kalanchoe plant

6. Sexual Reproduction
= fusion of two separate parent cells so offspring inherit some genetic info from each parent
Most animals and plants

7. Some organisms reproduce both sexually and asexually
Ex. Yeast

8. Advantages & Disadvantages
Asexual
A – if well suited to environment
D – if conditions change to not fit the organisms
Sexual
A – genetic diversity – if conditions change, can survive
A/D – takes time, wait for seasonal conditions and food