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Cell Cycle­Mitosis.notebook
April 21, 2015
The Cell Cycle ­ Mitosis
Cells divide by Mitosis or Meiosis. Mitosis allows the organism to replace cells that have died or malfunctioned, and makes an exact copy of the parent cell. Meiosis makes sex cells (eggs or sperm). These cells are different from the parent cell, and from each other. Jan 25­10:50 AM
Mitosis:
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1) Interphase ­ typically, the cell is resting, doing its job. When it is ready to copy itself, the chromosomes (made of DNA) in the nucleus copy themselves, resulting in 2 chromatids.
2) Mitosis: A) Prophase ­ Chromosomes begin to condense and becomes visible. The nucleolus disappears. Chromatid
Chromatid
B) Prometaphase ­ The nuclear membrane dissolves, and the chromosomes begin moving.
C) Metaphase ­ the chromosomes line up along the Chromosome
equator (middle) of the cell. Homologous chromosomes match up. (Homologous chromosomes are pairs of similar chromosomes, and are made of 2 chromatids).
Interphase
Prophase
Prometaphase
Metaphase
Jan 25­10:50 AM
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Cell Cycle­Mitosis.notebook
April 21, 2015
C) Anaphase ­ the chromatids separate and move toward opposite sides of the cell.
D) Telophase ­ the chromatids reach opposite sides of the cell, a nuclear membrane begins to form around each set of chromosomes, and the chromosomes begin to unwind.
3) Cytokinesis ­ the cell pinches in to form 2 cells identical to the original cell. In plant cells, a cell plate forms between the two daughter cells to create the cell wall.
Anaphase
Telophase
Cytokinesis
Jan 25­10:50 AM
**Mitosis creates 2 body cells, and each new cell is identical to, and has the same number of chromosomes as the original cell. Mitosis can happen over and over again!**
Which part of the cell cycle lasts the longest? Why is the cell cycle drawn in a circle? Ways to help you remember the order of steps in Mitosis:
IPPMAT­C
Mitosis Rap
Mitosis ­ "live"
Steelers vs. Mitosis
Jan 25­10:50 AM
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Cell Cycle­Mitosis.notebook
April 21, 2015
The Mitosis Rap
I is for Interphase ­ it’s step one. The step before mitosis has begun.
P is for Prophase ­ it’s step two. The chromosomes double, dawg. That’s what they do.
M is for Metaphase ­ it’s step three. The chromosomes line up as you can see.
A is for Anaphase ­ it’s step four. As chromosomes pull away from the core.
T is for Telophase ­ it’s step five, right. Two daughter cells are made and both are alike. A’ight? Break it down:
Mitosis tells all my cells to divide. Each cell puts chromosomes to opposite sides. It makes daughter cells that are two of a kind, two of a kind.
Mar 1­10:13 AM
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Attachments
Mitosis.asf
Meiosis.asf
MitosisRap.mp3