13119770
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
about 6 years ago
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| Question | Answer |
| 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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