Cells cycle

Mind Map by , created over 6 years ago

A-Levels Biology Mind Map on Cells cycle, created by charelle12 on 06/09/2013.

Created by charelle12 over 6 years ago
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Cells cycle
1 G1-new proteins and organelles formed
1.1 S phase- DNA replicated and chromatin doubles
1.1.1 G2- RNA and proteins sysnthesised MITOSIS Prophase nucleolus breaks down, nucleus breaks down, chromatids condense, centrioles migrate to opposite poles Metaphase spindle fibres form, chromosomes line up at the equator, microtubles of spindle attach to centromeres Anaphase centromeres divide, spindle fibres move chromatids to opposite poles Telophase chromosomes reach opposite poles, nuclear envelope forms around each Cytokinesis Animal cell: cleavage furrow forms, furrow deepens and when membrane fuses, cell is cleaved in 2 Plant cell: golgi bodies produce vesicles that collect and form an equatorial cell plate MEIOSIS Prophase I chromosomes condense (evident homologous are paired-bivalent). coromatids appear, chromatids break at chiasmata and rjoin with another chromatid CROSSING OVER Metaphase I bivalents move to equator randomly, chromosome pairs attach to spindle fibres by centromere INDEPENDENT ASSORTMENT Anaphase I chromosomes move towards poles Telophase I chromosomes reach poles, nuclear membrane forms ( nucleus has haploid chromosomes) Prophase II New spindle fibres form at right angles to old Metaphase II chromosomes line up along equator Anaphase II chromatids split at centromere and pull to opposite poles Telophase II nuclear envelope forms

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