Cell Division

cells- the essential link between generations

• genome: the sum total of all genetic information in a cell (organized into genes)

prokaryotic cells- bacteria divided by binary fission

• the single circular bacterial chromosome is replicated

• Replication begins at the origin

  of replication and proceeds bi-

  directionally

• New chromosomes are

partitioned to opposite ends of

the cell

• A septum forms to divide the

cell into 2 cells

cell cycle:

• cell cell division enables multicellular eukaryotes

  • gamets have one set of chromosime

  • somatic cells have two sets of chromosomes

• every eukaryotic species has a characterisitc number of chromosomes in each cell nucleus.

Interphsse:

• G1 phase- growing but not dividing

• s phase- replication (5^1 - 3^1 )