The Cell Cycle

&

Cell Division(Mitosis)

The Cell Cycle

http://www.nobel.se/medicine/laureates/2001/press.html

Animated Cycle

http://www.cellsalive.com/cell_cycle.htm

MITOSIS

Mitosis

The process of cell division which results

in the production of two “daughter” cells

from a single parent cell.

The daughter cells are identical to one

another and to the original parent cell.

The Stages of Mitosis

1st: InterphaseThe cell prepares for division

• Chromosomes

are copied

Centromere

Interphase

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

ProphaseThe cell prepares for division

• DNA condenses to

form chromosomes

• Centrioles appear

• Spindle fibers form

between the poles

Prophase

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

MetaphaseThe cell prepares chromosomes for division

• Spindle fibers

attach to the

chromatids

• Chromosomes line

in the midline of the

cell (the equator)

Metaphase

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

AnaphaseThe chromosomes divide

• Chromatids

separate and

begin to move to

opposite ends of

the cell.

Anaphase

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Telophase

• Two new nuclei

form

• Chromosomes

appear as

chromatin (threads

rather than rods)

• Mitosis ends

Telophase

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Cytokinesis

Two daughter cells are formed

• Cell membrane

pinches create two

daughter cells –

each with its own

nucleus and

identical

chromosomes