Cell Reproduction

Cells

• Your body is made of between 10 to 100 trillion cells

• About one thousandth of them die every day.

Where do new cells come from?

• Cells are made by a process called mitosis.• Cells reproduce by making exact copies of

themselves to replace the dead cell.

Cell Cycle

http://www.youtube.com/watch?v=ZEwddr9ho-4

Mitosis

• Interphase

• Prophase

• Metaphase

• Anaphase

• Telophase

Interphase

• Period of growth & development• Hereditary information (DNA) copied

(replicated / duplicated)

Prophase

•DNA begins to shorten & thicken –Now called chromatids / chromosomes

•Centromeres form•Nuclear membrane breaks apart•Spindle fibers form

Metaphase

•Chromatids / chromosomes line up•Centromere attaches to spindle fibers

Anaphase•Centromeres divide•Spindle fibers shorten•Chromatid pairs separate move to ends of cell•Chromatids are now called

–Each ½ of the pair is now called a chromosome

Telophase

•Spindle fibers disappear •Chromosomes uncoil•Nuclear membrane forms•Cell divides (cytokinesis)

Interphase

                                                            

Prophase

                                                            

Metaphase

                                                            

Anaphase

                                                            

Telophase

                                                            

Interphase

                                                            

http://www.youtube.com/watch?v=IlV9hExXZnM&feature=plcp• I Intelligent• P People• M Make• A Anything• T Totally great!