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Criado por J yadonknow
mais de 6 anos atrás
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Questão | Responda |
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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