1 7 cell cycle
TRANSCRIPT
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Launch1. Do all cells in the body have the
same DNA or different DNA?2. How many chromosomes do all cells
in the body have?3. What does “divide” mean?
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Cell Division and Cell Cycle
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Question…
What does the title “cell division” make you think about?
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NOTES
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Cell division
• The process of one cell dividing into two daughter cells is called cell division.
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3 Reasons why cells reproduce
• Growth• Repair• Replacement
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Think-Pair-Share:
• Name specific examples of when human cells need to make copies of themselves.– Hint: think about growth, repair, and
replacement.
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Genetic Material
• DNA: Instructions found in the nucleus• A chromosome is a long string of DNA that
organizes the DNA.
visible
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Chromosomes
• For example, humans have 46 chromosomes, but chickens have 78.
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Chromosomes
• A house fly has 12 chromosomes and a tomato plant has 24.
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Think-Pair-Share
Does more chromosomes mean the organism is more complex?
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Video
• http://www.youtube.com/watch?v=lf9rcqifx34&feature=related
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The cell cycle
• The cell cycle is the period of time from the beginning of one cell division to the beginning of the next.
• It consists of three stages:1. interphase2. mitosis3. cytokinesis
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Which part of the cell cycle takes the longest?
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The cell cycle
• Interphase:– the cell grows bigger,
develops, and performs its functions.
– made up of G0, G1, S and G2
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The cell cycle
• DNA replication:– the DNA makes a copy
of itself– the chromosomes
double
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The cell cycle
• Mitosis:– The nucleus divides
creating two cells, each with an identical set of chromosomes.
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