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- A single replication of chromosomes with 2 cell divisions.
- Reluslts in 4 daughter cells with haploid (N) chromosome #
Prophase I, Metaphase I, Anaphase I, Telophase I
- No DNA replication
- Prophase II, Metaphase II, Anaphse II, Telophase II
- 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
- Mix DNA from nonsister chromatids
- Bivalents line up on the equator
- Homologous split-sister chromatids stay attached.
- Reduces chromosome # to haploid
- Haploid set of chromosomes at each pole
- Cytokinesis occurs
No DNA replication
Spindles more chromosomes to equator
- Line up on equator
- Sister chromatids seperate & move to poles
- Nuclei form around 4 haploid daughter cells
- Chromosome replicates and has same structures as mitosis
- 2 daughter cells
- Maintains same chromosome #
- No genetic recombination
- 4 daughter cells
- Reduces to haploid from diploid chromosome #
- Genetic recombination occurs