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10 Cards in this Set
- Front
- Back
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Meiosis: Overall: |
Meiosis involves two divisions. - meiotic cells have an interphase stage before the start of meiosis 1 which is similar to mitosis - includes G1, S and G2 phases - after meiosis 1, there is another brief interphase stage which is followed by meiosis 2. |
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Prophase 1: |
- chromosomes pair up so that the chromosomes in each pair are homologous - once paired up, crossing over occurs - nuclear membrane starts to break down - spindle microtubules stretch out from each pole to the equator |
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Crossing Over |
- the exchange of genetic material between non-sister chromatids |
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Metaphase 1: |
- paired up homologous chromosomes line up at the equator - spindle fibers attached to the chromosomes - make sure one chromosomes moves to one pole and the other moves to the opposite pole |
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Anaphase 1: |
- homologous chromosomes are separated and pulled to opposite poles - chromosomes are halved still is comprised of two sister chromatids - cell membrane starts to prepare for its separation at the equator to form two cells |
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Telophase 1: |
- each chromosomes from the homologous pair are found at the opposite poles - nuclear membrane reforms around each daughter nucleus - membrane divides through citokinesis |
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Prophase 2: |
- cell has divided into two daughter haploid cells - spindle microtubules stretch out from each pole again - nuclear membrane breaks down |
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Metaphase 1: |
- chromosomes in each cell line up at the equator and the spindle microtubules attach to the centromere of each chromosome |
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Anaphase 2: |
- centromere devised as a result of the spindle microtubules pulling each sister chromatid to opposite poles in both cells - each sister chromatid then becomes a chromosome |
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Telophase 2: |
- nuclear membrane reforms around the four sets of daughter chromosomes - cytokinesis results to divide the cytoplasm of the two cells - the results is four daughter cells each with a haploid set of chromosomes |
