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Questions and Answers
What occurs during prophase I of meiosis I?
What occurs during prophase I of meiosis I?
What is the result of chromosomal crossover during meiosis I?
What is the result of chromosomal crossover during meiosis I?
What is true about metaphase I of meiosis I?
What is true about metaphase I of meiosis I?
What happens to the nuclear envelope during meiosis I?
What happens to the nuclear envelope during meiosis I?
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What is the significance of chromosomal crossover in meiosis I?
What is the significance of chromosomal crossover in meiosis I?
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What is unique about prophase I in meiosis I compared to mitosis?
What is unique about prophase I in meiosis I compared to mitosis?
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What is the result of having homologous sections of chromosomes crossover in meiosis I?
What is the result of having homologous sections of chromosomes crossover in meiosis I?
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What occurs to the chromosomes during metaphase I of meiosis I?
What occurs to the chromosomes during metaphase I of meiosis I?
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What happens to the homologous pairs in telophase I of meiosis I?
What happens to the homologous pairs in telophase I of meiosis I?
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What is the main difference between telophase I of meiosis I and telophase of mitosis?
What is the main difference between telophase I of meiosis I and telophase of mitosis?
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What happens to the microtubules during telophase I of meiosis I?
What happens to the microtubules during telophase I of meiosis I?
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What is the result of meiosis I?
What is the result of meiosis I?
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What happens to the nuclear membrane during telophase I of meiosis I?
What happens to the nuclear membrane during telophase I of meiosis I?
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What is meiosis II similar to?
What is meiosis II similar to?
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What happens to the sister chromatids in meiosis II?
What happens to the sister chromatids in meiosis II?
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What is the haploid number in each cell after meiosis I?
What is the haploid number in each cell after meiosis I?
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What happens to the sister chromatids in anaphase I?
What happens to the sister chromatids in anaphase I?
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What is the purpose of microtubules in meiosis?
What is the purpose of microtubules in meiosis?
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What happens to the homologous pairs in anaphase I?
What happens to the homologous pairs in anaphase I?
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What is the result of anaphase I in terms of genetic variation?
What is the result of anaphase I in terms of genetic variation?
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What is the significance of chromosomal crossover in meiosis?
What is the significance of chromosomal crossover in meiosis?
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What is the role of centrosomes in meiosis?
What is the role of centrosomes in meiosis?
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What is the difference between anaphase in mitosis and anaphase I in meiosis?
What is the difference between anaphase in mitosis and anaphase I in meiosis?
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What is the result of the process described in the passage?
What is the result of the process described in the passage?
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What is the significance of meiosis in the context of evolution?
What is the significance of meiosis in the context of evolution?
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What happens to the centromeres during anaphase I?
What happens to the centromeres during anaphase I?
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Study Notes
Meiosis I
- Prophase I:
- Nuclear envelope disappears
- Chromosomes condense into dense form with classic shape
- Chromosomal crossover occurs between homologous pairs, adding variation for sexual reproduction
- Metaphase I:
- Chromosomes line up along the cell's axis
- Centromeres attach to microtubules, which push centrosomes away from each other
- Microtubules attach to kinetochores on chromosomes, moving them around the cell
- Anaphase I:
- Homologous pairs of chromosomes get pulled apart, but sister chromatids stay together
- This differs from mitosis, where sister chromatids get pulled apart
- The split is random, adding more variation to gametes
- Telophase I:
- Homologous pairs are fully split apart and at opposite ends of the cell
- Chromosomes begin to unravel into chromatin state
- Nuclear membrane starts to form again
- Cytokinesis begins, eventually separating into two cells
- Meiosis I outcome:
- Two haploid cells with a haploid number of two chromosomes each
- Each chromosome has two sister chromatids, to be split in Meiosis II
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Description
This quiz covers the unique features of prophase I in meiosis I, including the disappearance of the nuclear envelope and chromosome condensation. It compares and contrasts prophase I in meiosis with prophase in mitosis.