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Ch 9 The Cellular Basis of LifeCh 9 The Cellular Basis of Life
9.1 Cells come from 9.1 Cells come from CellsCells
Cells are needed forCells are needed for
MitosisMitosis: repair, growth,: repair, growth,
asexual reproduction (clones of one asexual reproduction (clones of one parent)parent)
MeiosisMeiosis: sexual reproduction: sexual reproduction
(two parents)(two parents)
Video clip (3 minute overview of mitosis/cancer)Video clip (3 minute overview of mitosis/cancer)
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9.2 The cell cycle multiplies cellsDifferent number of chromosomes for each organism (humans have 46)
Interphase: Chromosomes duplicate before the cell divides
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Mitosis- nucleus divided
and Cytokinesis-cell divides
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9.3 Mitosis9.3 Mitosis
Prophase=Prophase=pairspairs
Metaphase=Metaphase=middlemiddle
Anaphase=Anaphase=awayaway
Telophase=Telophase=twotwo
Cytokinesis Cytokinesis animalsanimals
Cell plate Cell plate plantsplants
Onion root tipOnion root tip
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9.4 Cancer
Cancer is due to uncontrolled cell cycle Benign –local tumor Malignant- travels around body by
metastasis
Treatment=surgery, radiation,
chemotherapy
(some disrupt mitotic spindle)
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9.5 Meiosis is used in sexual reproduction Meiosis only occurs in sperm and egg so
the new offspring doesn’t have double the chromosome number
Diploid Haploid Chick embryo Pig embryo Human embryo
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Meiosis- two divisions
Results in four cells
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9.6 Meiosis increases 9.6 Meiosis increases genetic genetic variationvariation
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Crossing overCrossing over
In MeiosisIn Meiosis