Handout04MitosisMeiosis

- sister centromeres split and chromatids move to opposite pole Homologs separate and move to opposite poles(sister centromeres do not split but

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BIS101-001/Engebrecht Spring 2010 Handout04Mitosis/Meiosis Division Mitosis MeiosisI (reductional division) MeiosisII (equational division) Interphase Ploidy = 2N DNA content = 2C Ploidy = 2N DNA content = 2C Ploidy = 1N DNA content = 2C Chromosomes decondensed DNA synthesis in S Chromosomes decondensed DNA synthesis in S Occurrence of interphase varies No DNA synthesis Prophase Ploidy = 2N DNA content = 4C Ploidy = 2N DNA content = 4C Ploidy = 1N DNA content = 2C Chromosomes condense, sister chromatids visible, cohesion holds sisters together Chromosomes condense, sister chromatids visible, cohesion holds sisters together, homologs pair and recombine Chromosomes condense sister, sister chromatids visiable, sister centromere cohesion holds sisters together Metaphase Chromosomes line up on Metaphase plate Homologs line up on Metaphase plate Chromosomes line up on Metaphase plate Anaphase Sister chromatid cohesion dissolved,
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Unformatted text preview: sister centromeres split and chromatids move to opposite pole Homologs separate and move to opposite poles (sister centromeres do not split but are held together by sister chromatid cohesion*) Sister chromatid cohesion dissolved at centromeres, sister chromatids move to opposite poles Telophase Nuclear envelope reforms, chromosomes decondense, cytokinesis Ploidy = 2N DNA content = 2C Occurance of telophase varies, cytokinesis Ploidy = 1N DNA content = 2C Nuclear envelope reforms, chromosomes decondense cytokinesis Ploidy = 1N DNA content = 1C Your text refers to sister chromatid cohesion as adhesion, I will use the term cohesion. Your text says that cohesion is maintained along the entire length until Anaphase II. However, only centromere cohesion is maintained until that time; cohesion on the arms is dissolved for crossovers to be resolved and homologs to segregate away from each other....
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This note was uploaded on 07/02/2010 for the course BIS 101 taught by Professor Simonchan during the Spring '08 term at UC Davis.

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