Chapter 8
Order
Reproduction
Growth and development
Energy processing
Response to the environment
Regulation
Evolutionary adaptation http://www.youtube.com/watch?v=46Xh7OFkkCE Introduction
Cancer cells start out as normal body cells undergo genetic mutations lose the ability to control the tempo of their own division run amok, causing disease
In a healthy body, cell division allows for: growth the replacement of damaged cells development from an embryo into an adult
In sexually reproducing organisms, eggs and sperm result from:
Mitosis
Meiosis
Cell Division and Reproduction
8.1 Cell division plays many important roles in the lives of organisms
Organisms reproduce their own kind, a key characteristic of life
Cell division is reproduction at the cellular level requires the duplication of chromosomes sorts new sets of chromosomes into the resulting pair of daughter cells
Cell division is used: for reproduction of single-celled organisms growth of multicellular organisms from a fertilized egg into an adult repair and replacement of cells sperm and egg production
Living organisms reproduce by two methods:
Asexual reproduction produces offspring that are identical to the original cell or organism involves inheritance of all genes from one parent
Sexual reproduction produces offspring that are similar to the parents, but show variations in traits involves inheritance of unique sets of genes from two parents
8.2 Prokaryotes reproduce by binary fission
Prokaryotes (bacteria and archaea) reproduce by binary fission (“dividing in half”)
The chromosome of a prokaryote a singular circular DNA molecule associated with proteins much smaller than those of eukaryotes
Binary fission of a prokaryote occurs in three stages:
1. duplication of the chromosome and separation of the copies
2. continued elongation of the cell and movement of the copies
3. division into two daughter cells
The Eukaryotic Cell Cycle and Mitosis
8.3 The