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Biology CP-Mr.WilletsName__________________________
Mitosis is the division of a cell's nucleus where each new nucleus (daughter nucleus) gets a full set of chromosomes (DNA). After the nucleus divides, the rest of the cell splits in two. Although the name mitosis only refers to the division of the nucleus, we often use it to mean the division of both the nucleus and the rest of the cell.
The process of mitosis is used to create new cells for growth, repair and asexual reproduction.
Mitosis occurs as one continuous process but we divide it into phases to make it easier to study.
Pg 131 - Cell Cycle
1)The period of cell growth after mitosis is called _______________________ The division of the cell nucleus is called _________________ The division of the cytoplasm is called _____________________
Pg 132 Interphase
2) During the G1 phase of interphase, the cell _________________ in size. During the S phase of interphase, the DNA _______________________ During the G2 phase of interphase, the cell grows rapidly to prepare for _____________________
Pg 132-133 Phases of Mitosis
3) The first phase of mitosis is called ______________________________
4) During prophase, the chromatin threads thicken and become _________________________
During prophase, what two structures have disappeared? _____________________________
During prophase two types of ___________________ fibers form.
5) During which phase do the chromosomes line up along the center (equator) of the cell? __________________
6) During which phase do the chromatids of each chromosome separate? ___________________ What pulls the two sets of chromatids to opposite ends (poles) of the cell? ________________________
7) The last phase of mitosis is called ___________________________ The chromatids (now called chromosomes) stretch out and go back to being _____________________ The nuclear _____________
and nucleolus reappear and the spindle fibers _________________________
The book does not cover the following very well-
Once the nucleus has divided, then the cytoplasm must divide. This is called cytokinesis. In animal cells, the sides of the cell "pinch in" until the cell is divided in half. This is similar to you squeezing a balloon in the middle to divide it into two parts. (see diagram upper left pg 134)
In plant cells, a cell plate starts to form in the middle of the cell and grows outward to meet the edges.
What structure does a plant cell have that would not allow "pinching in"? (see diagram upper right pg 135)
11) List the phases of mitosis in order (do not include interphase)
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