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Biology: Meiosis I
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What are the 6 phases of Meiosis I?
1) Prophase I
2) Prometaphase I
3) MetaphaseI
4) 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
parent
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
Author
kyky200910
ID
13661
Card Set
Biology: Meiosis I
Description
Phases of Meiosis I
Updated
2010-04-09T04:11:38Z
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