Biology: Meiosis I
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What are the 6 phases of Meiosis I?
- 1) Prophase I
- 2) Prometaphase I
- 3) MetaphaseI4) Anaphase I
- 5) Telophase I
- 6) Cytokinesis
What happens in Prophase I?
- - DNA replication starts
- - homologous chromosomes pair (bivalents)
- - form synapses
- - bivalent has 2 chromos., 4 chromatids, 1 chromo. from each
what happens in Prometaphase I?
- - nuclear membrane disappears
- - 1 kinetochore per chromo, rather than 1 per chromatid
- - chromos. attach to spindle fibers, beginning to move
What happens in Metaphase I?
- - Bivalents align at metaphase plate (2 chromos, 4 chromatids)
- - in random orientation
- - each parental homologue crossing each (50/50 chance)
What happens in Anaphase I?
- -Chiasmata seperate (divided equally)
- - chromos. each w/ 2 chromatids move to separate poles
- - daughter cells are now haploid (23 chromos)
- - each chromo has 2 chromatids
What happens in Telophase I?
- nuclear envelopes reform and cell quickly starts Meiosis II
What happen in Cytokinesis?
- 2 complete daughter cells form
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