biol1201 test 3 notes

biol1201 test 3 notes - Biology Notes Test 3 Growth and...

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Biology Notes Test 3 Growth and repair: How do cells reproduce? Cells need to possess the genetic material characteristic of the organism Genetic material is DNA The “daughter” cells need the complete genetic complement Prokaryotes Circular strands of DNA Replicate the DNA and pass it on to the “daughter” cells  Divide by binary fission Eukaryotes A problem Genetic material is found in linear chromosomes o Linear strands of DNA complexed with proteins o Multiple chromosomes (e.g., humans 46) How to insure that each daughter cell gets the complete set of chromosomes? How do you get identical daughter cells? Need a mechanism to allow each daughter cell to have a copy of each chromosome The Solution A process called mitosis Cell Division: Mitosis Reproduction Growth Repair Dell Division: Mitosis Produce “daughter” cells that have identical genetic complements Occurs in somatic cells Somatic Cells
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All body cells except cells which give rise to gametes Chromosomes A complex of linear strand of DNA and protein Each eukaryotic species has a characteristic number Found in nucleus Chromatin The long linear strand of DNA and complexed proteins Duplicated chromosomes Consists of two sister chromatids Identical copies of DNA Attached at a specialized region called  centromere The division of the chromosomes happens in the mitotic phase in the  cell cycle. Cell Cycle Interphase Mitotic phase o Mitosis- division of chromosomes o Cytokinesis- division of cytoplasm Interphase Generally 90% of the cell cycle Gap 1(G1) S Phase Gap 2 (G2) Gap 1 Synthesis of cell components Increase in number of organelles S Phase Synthesis (replication) of DNA
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Doubling of the genetic material 
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This note was uploaded on 04/10/2008 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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biol1201 test 3 notes - Biology Notes Test 3 Growth and...

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