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

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

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