Cell Cycle II

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Flashcards on Cell Cycle II, created by J yadonknow on 04/04/2018.
J yadonknow
Flashcards by J yadonknow, updated more than 1 year ago
J yadonknow
Created by J yadonknow almost 7 years ago
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What occurs during Meiosis I prophase I? Homologous recombination
5 phases of prophase I 1. Leptotene 2. Zygotene 3. Pachytene 4. Diplotene 5. Diakinesis
Leptotene Duplicated chromo start to condense
Zygotene (3) Bivalent forms Synaptonemal complex forming Synapsis begins
Pachytene (2) Synapsis complete Crossing over occurs
Diplotene (2) Synaptonemal complex disappearing Chiasma visible
Diakinesis Bivalent ready for metaphase
Scaffolds of synaptonemal complex (2) Lateral elements stabilise the joining Central element holds it all together
Metaphase I (2) Bivalents attached via KC to spindle MT Migrate to spindle equator
Telophase I Chromo decondense N. membrane may reform around them, usually doesn't
Meiosis II Resembles mitosis but w/ 1/2 chromosomes
Cytokinesis Actin + myosin filaments of the contractile ring associated w/ PCM MT walked in opposite directions to one another, push against each other, contribute to constriction. Contractile ring causes cleavage furrow
Plant cell cytokinesis Phragmoplast in centre MT trapped Forms pore through which plasmodesmata pass
Cytokinesis in drosophila Drosophila embryo mitosis occurs without cell division PCM full of nuclei
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