cell reproduction. cells your body is made of between 10 to 100 trillion cells about one thousandth...
TRANSCRIPT
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!