namemy pts pts poss.tot “my pts” tppgrade 12 cell test 65395 homework for week of dec 19 - 24...
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Name My pts
Pts Poss. Tot “My Pts”
TPP Grade
12 Cell Test
65 395
Homework for week of Dec 19 - 24Mon. Read Ch.3
Tues. Work Day
Weds.$3 PizzaPer. 7
Mitosis Flipbooks Due Thurs. Beginning of class
Thurs. None
Friday Happy Holidays!
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Homework for week of Dec 19 - 24
Mon. 8.2 Unit Guide
Tues.Mitosis Flipbooks Due Thurs.
Beginning of class
Weds.$3 Pizza due Semester Final Today!
Thurs. None
Friday Happy Holidays!
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Name My pts
Pts Poss. Tot “My Pts”
TPP Grade
12 Ch 7 UnitGuide
20
13 Current Event
40
14 Cell Test 80 4301 5 Sem
Midterm100 530
16 Mitosis Flipbook
40 570
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Today’s Goal:Explore how and why cells
divide.
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Cells divide. This makes cells small.
Why do cells divide?
Why must cells be small?
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7 7
Asexual ReproductionMitosis
Mitosis is the process in which the nucleus divides to form two new nuclei.
How does mitosis differ in plants and animals?
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How do little elephants grow up to be BIG elephants?
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The process of asexual reproduction begins
after a sperm fertilizes an egg.
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Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
Cell that reproduce by asexual reproduction reproduce constantly.
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1. Growth- increase in size of the organism (by dividing cells, not by increasing the size of the cells)
2.Repair – needed because of worn out or injured cells (your skin cells are replaced every 28 days; your stomach every 7)
3. Reproduction (2 types) Asexual – one parent. Offspring identical
to parent - mitosis Sexual – combination of genetic material
from two parents - meiosis
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Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
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• Chromosomes are copied (# doubles)• Chromosomes appear as threadlike coils
(chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANENucleus
Cytoplasm
Centromere
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Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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• Mitosis begins (cell begins to divide)• Centrioles (or poles) appear and begin to
move to opposite end of the cell. • Spindle fibers form between the poles.
CentriolesSister chromatids
Spindle fibers
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Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
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• Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers
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Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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• Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers
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Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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• Two new nuclei form. • Chromosomes appear as chromatin
(threads rather than rods).• Mitosis ends.
NucleiNuclei
Chromatin
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Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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• Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.
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Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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Plant Mitosis -- ReviewInterphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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- Cell Division
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http://www.cellsalive.com/mitosis.htm