Cell division occurs in a series of stages, or phases.

Mitosis Notes

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

Sister chromatids

Centromere

2nd: PROPHASE

? Mitosis begins (cell begins to divide) ? Centrioles (or poles) appear and begin to move to

opposite ends of cell ? Spindle fibers form between the poles

3rd: METAPHASE

? Chromatids (or pairs of chromosomes) attach to the

spindle fibers

Sister chromatids

4th: ANAPHASE

? Chromatids (or pairs of chromosomes) separate and

begin to move to opposite ends of the cell

Sister chromatids

split

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

Mitosis Notes

Name ______________________

__________ _________________ occurs in a series of stages, or _____________.

1st: _______________

? Chromosomes are ___________ (# doubles)

? Chromosomes appear as threadlike coils (__________________)

at the start, but each chromosome and its copy

(____________ chromosome) change to sister chromatids at

end of this phase

Sister chromatids

_________________

2nd: ______________

? ______________ begins (cell begins to divide) ? __________________ (or poles) appear and begin to move to

opposite ends of cell ? ____________ _________ form between the poles

3rd: _______________ ? _________________ (or pairs of chromosomes) attach to the

spindle fibers

Sister chromatids

4th: _______________ ? Chromatids (or pairs of chromosomes) _______________ and begin to move to ________________ ends of the cell

Sister chromatids

split

5th: _______________ ? Two new _____________ form ? Chromosomes appear as chromatin (_____________ rather than __________) ? ________________ ends

6th: _______________ ? Cell membrane moves inward to create two _________________ cells - each with its own ________________ with identical _____________________

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