Mitosis Notes Answers

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Cell division occurs in a series of stages or phases.

1st: INTERPHASE
-Chromosomes are copied (# doubles)
-Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy (sister chromosome) change to sister chromatids at end of this phase

[drawing]<- Centromere

2nd: PROPHASE
-Mitosis begins (cell begins to divide)
-Centrioles (or poles) appear and begin to move to opposite ends of the cell
-Spindle Fibers form between the poles

3rd: METAPHASE
-Chromatids (for pairs of chromosomes) attach to the spindle fibers

4th: ANAPHASE
-Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell

5th: TELOPHASE
-Two new nuclei form
-Chromosomes appear as chromatin (threads rather than rods)
-Mitosis ends

6th: CYTOKINESIS
-Cell membrane moves inward to create two daughter cells - each with its own nucleus with identical chromosomes