19mitosis2 - Lecture 19: Mitosis Chapter 18: Cell Division...

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Lecture 19: Mitosis Chapter 18: Cell Division
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The Big Picture What happens during the cell division stage of the cell cycle? Mitosis
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The Cell Cycle Interphase: majority is normal cell function , followed by preparation for cell division True for cells not arrested in G 0
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Cell Division Two stages following Interphase: 1.) Mitosis 2.) Cytokinesis
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Mitosis Duplication division DNA must duplicate for cell division to take place Each new cell contains same number of chromosomes as parent cell
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Mitosis Overview One parent cell divides into two daughter cells Each daughter cell is genetically identical to each other and to the parent cell
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Before Mitosis (Interphase) Chromatin condenses into visible chromosomes DNA replication (S stage) duplicates chromosomes into two sister chromatids held at centromere
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Diploid (2n) Number Human body cells have 46 chromosomes Diploid: 23 pairs X 2 2n (diploid number) = 46
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Vs. Haploid (n) Number Sex cells (sperm or egg, called gametes ) contain only 23 chromosomes When sperm meets egg, 23 + 23 = full 46 Haploid: 23 chromosomes n (haploid number) = 23
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19mitosis2 - Lecture 19: Mitosis Chapter 18: Cell Division...

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