Mitosis

Mitosis

******* here is a great link showing the mitosis and meiosis!!

http://www.pbs.org/wgbh/nova/baby/divi_flash.html

What: Duplication of cells. One parent cells divides and makes two genetically identical daughter cells. The parent cell, and the daughter cells all have 46 chromosomes and are diploid.

When: Cells divide all the time to replace dead or damaged cells and to facilitate growth (think about a root of a plant!)

Before mitosis DNA replicates.

Prophase
Chromosomes shorten and thicken
Centrioles move to opposite poles
Nuclear membrane fades

Metaphase
Chromosomes line up in single file on the equatorial plate
Spindle fibers come from centrioles and attach to centromere

Anaphase
Centromere divides
Sister chromatids are pulled apart to opposite poles

Telophase
Chromosomes are on opposite poles
Spindle fibers dissolve
Nuclear membrane forms

Cytokinesis
Cytoplasma divides
2 new cells form
In plants a cell plate forms between the two cells and turns into a cell wall, in animals cells furrow into two cells.