Cell Growth and Division Chapter 10 Cell Growth and Division

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

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

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

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

Some organisms reproduce both sexually and asexually Ex. Yeast

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