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Mitosis Notes: KEY WORDS/ QUESTIONS PROKARYOTIC CELL DIVISION (7.1): Chapter 7 NOTES *All bacteria (examples) *Binary Fission http://www.classzone.com/books/hs/ca/sc/bio_07/animated_biology/bio_ch05_01 49_ab_fission.html *Replication happens just like we learned on our last notes. Cell Cycle: (7.2) A: B: EUKARYOTES ONLY C: D: I: EI: AC: I Identify the name of each stage and tell me what is happening there. Chromosomes (7.3) The G0 phase (Coming off of “A”) as the cell retirement home, where some cells divide once and then never again. http://www.cellsalive.com/cell_cycle.htm http://www.cell-action.com/cell_cycle/cell_cycle.html AMAZING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!! Chromosome Number: The amount of DNA an organism has does not correlate to their size...some bacteria have more DNA. Our DNA, unlike the one circular chromosome that bacteria have, is “divided” into pieces known as chromosomes. Most of our cells have 46 of them...one set of 23 from mom, one set of 23 from daddy. Key Vocab Terms: a. Chromosome: tightly coiled lengths of DNA that are sectioned into genes. b. Homologous Chromosomes: two chromosomes that have the same genes, in the same order, are the same size, have their centromere in the same location, and have the same banding pattern (see karyotype) Mitosis Notes: Chapter 7 c. Diploid: Cells that have two sets of DNA – one set from each parent. Often designated as 2n...where n stands for the amount of DNA in a set and the 2 means you have 2 sets. d. Haploid: Cells that have one set of DNA. Often designated as “n”. AKA gametes e. Somatic Cell: AKA body cells – any diploid cell f. Sister chromatids: Identical copies of chromosomes attached at centromeres. Karyotypes: a “picture” of all the DNA in one cell...scientists can use them to determine if there are any problems! Chromosome structure: DNA coiled around histone proteins. Must occur b/c nucleus disappears and cells need to protect their DNA from getting destroyed by all the bad guys in the cytoplasm. Mitosis (149151): This is the original cell. Show what it would look like in G1 with six chromosomes. Label each of the phases and show what happens to the six chromosomes during mitosis. Mitosis Notes: Cytokinesis Meiosis (153155): Chapter 7 Nothing special...do what you always do! http://www.hybridmedicalanimation.com/anim_mitosis.html Definition: division of cytoplasm and organelles to each new cell. Plants: cell plate forms Animals: cleavage furrow forms Label each of the phases and show what happens to the six chromosomes during mitosis. This is the original cell. Show what it would look like in G1 with six chromosomes. http://www.sumanasinc.com/webcontent/animations/content/meiosis.htm l http://www.pbs.org/wgbh/nova/miracle/divide.html - AWESOME!!!! Key to discuss: crossing over, alignment at metaphase Mitosis Notes: Meiosis/Mitosis Summary: Chapter 7 1. What is different about mitosis vs. meiosis during prophase? 2. What is different about mitosis vs. meiosis during metaphase?