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Meiosis
- A single replication of chromosomes with 2 cell divisions.
- Reluslts in 4 daughter cells with haploid (N) chromosome #
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Meiosis I
Prophase I, Metaphase I, Anaphase I, Telophase I
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Meiosis II
- No DNA replication
- Prophase II, Metaphase II, Anaphse II, Telophase II
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Prophase I
- Longer and more complex than mitosis
- Chromosomes condense & attach to Nuclear membrane- Bivalents form.
- synapsis occurs- tetrad forms
- Crossing over occurs at chiasmata (one to several places)
- Genetic Recombination
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Genetic Recombination
- Mix DNA from nonsister chromatids
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Metaphase I
- Bivalents line up on the equator
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Anaphase I
- Homologous split-sister chromatids stay attached.
- Reduces chromosome # to haploid
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Telophase I
- Haploid set of chromosomes at each pole
- Cytokinesis occurs
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Meiosis II
No DNA replication
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Prophase II
Spindles more chromosomes to equator
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Metaphase II
- Line up on equator
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Anaphase II
- Sister chromatids seperate & move to poles
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Telophase II
- Nuclei form around 4 haploid daughter cells
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Interphase I
- Chromosome replicates and has same structures as mitosis
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Mitosis
- 2 daughter cells
- Maintains same chromosome #
- No genetic recombination
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Meiosis
- 4 daughter cells
- Reduces to haploid from diploid chromosome #
- Genetic recombination occurs
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