Cell Division Chapter 3.1. Do Now What happens when you get cut? Explain in your own words what...
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Transcript of Cell Division Chapter 3.1. Do Now What happens when you get cut? Explain in your own words what...
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Cell DivisionChapter 3.1
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Do Now• What happens when you get cut? • Explain in your own words what
happens when you are cut and the healing process.
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Cell division occurs in all organisms– Unicellular organisms (ex: bacteria)• Binary fission
– Multicellular organisms (ex: US!)• Mitosis
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Cells needs a high surface area to volume ratio
1. All organisms start as a single cell
a) Growth- limited by surface area (needs high ratio of surface area to volume)
b) High SA allows nutrients in & waste out
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Why do we need cell division?• It is involved in many functions!
1. Growth – get bigger
2. Development – change
3. Repair – fix damaged or old cells
4. Reproduction – make new cells
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DNA – deoxyriobonucleic acid• A chemical that contains information
for an organism’s growth and functions.
• Double helix like a twisted ladder
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Chromosomes• In Eukaryotic cells, DNA is found in
the nucleus• DNA is wrapped around proteins like
thread around a spool, compacted into structures called chromosomes.
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We have 46 total chromosomes= 23 pairs
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Question• Even when you are done growing and
development appears to stop, is cell division still occurring?
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Growth• In general, large organisms do not
have larger cells than smaller organisms.
• Simply, they just have more cells.• As an adult, you have about 100
trillion cells!
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Development
• During development, cells become specialized to perform particular functions.
• These cells may take on shapes or structures that help them perform their functions.
Some become skin cells, nerve cells, etc. These cells have the same genetic material
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Repair 78• The body repairs body injuries through cell
division. Ex: cut on skin or broken leg• As cells age and die, they need to be replaced.
• We are made up of 200 different types of cells• Every minute, you lose 40,000 skin cells!• Brain cells live long and do not divide often
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• Surface area to volume• http://www.brown.edu/Courses/BI0020_Miller/
week/10/web-1/4-2-2007_10-20-26/Chapter_41/Present/Animations/41_A01/41_A01s.html
• Multicellular division• http://www.youtube.com/watch?v=AhgRhXl7
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• Unicellular division:• http://www.youtube.com/watch?v=J6akNYlke
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