Lecture Series 5 Cell Cycle & Cell Division

Lecture Series 5

Cell Cycle & Cell Division

Reading Assignments

? Read Chapter 18

Cell Cycle & Cell Division

? Read Chapter 19

pages

p

g 651651-663 only

y

(Benefits of Sex & Meiosis sections ¨C

these are in Chapter 20 in 2nd Edition)

A Systems of Cell Division

A.

? C

Cell

ll division

di i i iis necessary f

for reproduction,

d ti

growth, and repair of an organism.

? Cell division must be initiated by three

steps: DNA replication, DNA separation,

and then division of the cytoplasm.

? In microbes, cellular DNA is a single

molecule, or chromosome. Bacteria &

Archaea reproduce by binary fission.

fission

? In eucaryotes,

eucaryotes, nuclei divide by either

mitosis or meiosis.

Bacterial cell division (binary fission):

Universal functions of the cell cycle

? Replicate the DNA.

DNA

? Segregate it into

daughter cells.

cells

? Replicate and/or

distribute

di t ib t

organelles into

d

daughter

ht cells.

ll

? Grow & do it again!

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