1. Ch. 5 Mitosis & Asexual Reproduction
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2. 5.1 The Cell Cycle & Mitosis
The life of a cell has 3 stages
known as the cell cycle:
Interphase: cell carries out normal functions
Mitosis: nucleus contents duplicate & divide into two equal parts.
Cytokinesis: separation of two nuclei & cell contents into two daughter cells.
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3. (c) McGraw Hill Ryerson 2007
Cell Cycle
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4. Parts of the Cell Cycle Interphase the longest cell cycle stage
when a cell performs normal functions & grows
In late interphase, DNA copies itself in the process of replication.
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5. DNA Replication Replication steps:
DNA molecule unwinds with the help of an enzyme.
New bases pair with the bases on the original DNA.
Two new identical DNA molecules are produced.
At the end of interphase, the cell continues to grow & make proteins in preparation for mitosis and cytokinesis.

6. Mitosis the shortest stage nuclear contents divide
two daughter nuclei are formed
4 stages: Prophase, Metaphase, Anaphase and Telophase.
When the nucleus prepares to divide, replicated DNA in interphase join to form sister chromatids, joined by a centromere.
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7. (c) McGraw Hill Ryerson 2007
Stages of Mitosis
Early Prophase - nucleolus disappears & spindle fibres form Late Prophase - spindle fibres attach to centromeres of chromosomes Metaphase - chromosomes align on equator of cell Anaphase - spindle fibres pull sister chromatids to opposite poles of cell Telophase - spindle fibres disappear & a nuclear membrane forms around each separated set of chromosomes.
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8. (c) McGraw Hill Ryerson 2007
Cytokinesis
is the separation of the nuclei into two daughter cells
(c) McGraw Hill Ryerson 2007