The Cell Cycle The Cell Cycle - DOC

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The Cell Cycle The Cell Cycle - DOC Powered By Docstoc
					                               The Cell Cycle
                                Chapter 11

Name ________________________________________


•   ________________: structures in the cell that contain the genetic
    information (DNA) passed from one generation to the next
•   _________________: made of DNA and protein; material that
    chromosomes are made of
•   _________________: there are two of these in each chromosome;
    identical to one another

•   Centromere: where the _______________are attached on each

•   Centrioles: two tiny structures located in ___________near the nuclear

•   Spindle: a meshlike structure that helps move the chromosomes apart.
    This develops from the________________.

•   ____________________: the process by which the nucleus of the cell
    is divided into two nuclei - each with the same number and kind of
    chromosomes as the parent cell

•   ______ _____________: the process by which a cell divides into two
    identical daughter cells. This includes the processes of interphase, mitosis
    and cytokinesis.
The Cell Cycle
• During the cell cycle, the cell grows and develops, prepares for division
  and divides to form two daughter cells that will then begin the cycle again.

1. Interphase:
•   The period between cell divisions
•   G1 = gap 1 - time of cell growth and development
•   S = DNA synthesis - DNA replication occurs
•  G2 = gap 2 - creation of organelles and materials necessary for cell division
2. Prophase:
•   Beginning of Mitosis
•   Longest phase
•   Chromosomes become visible
•   _________________separate from each other and move to opposite
    sides of the nucleus
•   Condensed chromosomes attach to the fibers of the spindle at a point
    near the centromere of each chromatid
•   ____________________ disappears and nuclear envelope breaks down

3. Metaphase:
• Shortest phase of Mitosis
• Chromosomes move and _____ ____across the center (or__________)
   of the cell

4. Anaphase:
•   Begins when the ________________split, causing the sister chromatids
    to separate
•   Separated chromosomes travel along the spindle to the two ______of the
•   Ends when movement of chromosomes stops

5. Telophase:
•   Final phase of Mitosis
•   Nuclear envelope reforms around the chromatin at each end / pole
•   Spindle begins to break down
•   ______________ becomes visible in each daughter nucleus
6. Cytokinesis:
•   The division of cytoplasm into two individual yet identical cells
•   In animal cells, the cell membrane moves inward until cytoplasm is pinched
    into two nearly equal parts
•   In plant cells, a cell plate forms between the two nuclei and then turns
    into a new cell wall

The cell cycle includes steps ____ thru _____.
Mitosis, the division of the nucleus, involves steps _____ thru ______.

Stages of the cell cycle.

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