Chapter 2.2. Animation Activity: Meiosis

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Correct. Pairing of homologous chromosomes begins in prophase I of meiosis, and homologous chromosomes will remain paired until anaphase I.

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Incorrect. Pairing of homologous chromosomes begins in prophase I of meiosis, and homologous chromosomes will remain paired until anaphase I.

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Correct. Homologous chromosomes separate during anaphase I. Sister chromatids separate during anaphase II.

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Incorrect. Homologous chromosomes separate during anaphase I. Sister chromatids separate during anaphase II.

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Correct. When a cell completes meiosis I, during telophase I, the cell divides and each daughter cell nucleus contains half the number of chromosomes that were present in the original cell that entered prophase I.

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Incorrect. When a cell completes meiosis I, during telophase I, the cell divides and each daughter cell nucleus contains half the number of chromosomes that were present in the original cell that entered prophase I.

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Correct. The amount of DNA is reduced by half in mitosis, meiosis I, and in meiosis II.

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Incorrect. The amount of DNA is reduced by half in mitosis, meiosis I, and in meiosis II.

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Correct. During meiosis I a cell goes from being diploid to being haploid. This requires the halving of the number of chromosomes.

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Incorrect. During meiosis I a cell goes from being diploid to being haploid. This requires the halving of the number of chromosomes.

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Correct. Although a cell in G1 of interphase will have twice the number of chromosomes as a cell in metaphase II, the amount of DNA will be equivalent. For example, if a diploid cell had 12 chromosomes, a cell in G1 would have 12 chromosomes and 12 DNA molecules. Likewise a cell in metaphase II would have six chromosomes, each consisting of two chromatids for a total of 12 DNA molecules.

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Incorrect. Although a cell in G1 of interphase will have twice the number of chromosomes as a cell in metaphase II, the amount of DNA will be equivalent. For example, if a diploid cell had 12 chromosomes, a cell in G1 would have 12 chromosomes and 12 DNA molecules. Likewise a cell in metaphase II would have six chromosomes, each consisting of two chromatids for a total of 12 DNA molecules.

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Correct. Although a cell entering meiosis II would have six chromosomes, each of these chromosomes would consist of two double-stranded DNA molecules (sister chromatids). During anaphase, the sister chromatids separate resulting in 12 chromosomes until the completion of telophase II when each daughter cell would have six chromosomes, each consisting of a single DNA molecule.

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Incorrect. Although a cell entering meiosis II would have six chromosomes, each of these chromosomes would consist of two double-stranded DNA molecules (sister chromatids). During anaphase, the sister chromatids separate resulting in 12 chromosomes until the completion of telophase II when each daughter cell would have six chromosomes, each consisting of a single DNA molecule.

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Correct. Homologous chromosome pairs, that first joined in prophase I, line up on the metaphase plate in metaphase I. These chromosome pairs separate during anaphase I, whereas chromosomes line up on the metaphase plate individually during metaphase II, and centromeres joining sister chromatids divide creating new chromosomes during anaphase II.

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Incorrect. Homologous chromosome pairs, that first joined in prophase I, line up on the metaphase plate in metaphase I. These chromosome pairs separate during anaphase I, whereas chromosomes line up on the metaphase plate individually during metaphase II, and centromeres joining sister chromatids divide creating new chromosomes during anaphase II.

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Correct. DNA is not replicated between meiosis I and meiosis II. Also, since a cell entering meiosis II is haploid, the number of chromosomes in a cell entering meiosis II is half the number in a cell entering mitosis. Also, a cell entering meiosis II will contain half the amount of DNA compared to a cell entering mitosis. Therefore, the only correct answer is “C” because individual chromosomes line up on the metaphase plate in both mitosis and meiosis II.

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Incorrect. DNA is not replicated between meiosis I and meiosis II. Also, since a cell entering meiosis II is haploid, the number of chromosomes in a cell entering meiosis II is half the number in a cell entering mitosis. Also, a cell entering meiosis II will contain half the amount of DNA compared to a cell entering mitosis. Therefore, the only correct answer is “C” because individual chromosomes line up on the metaphase plate in both mitosis and meiosis II.

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Correct. If a single pair of homologous chromosomes failed to separate in anaphase I, one of the daughter cells would inherit an extra chromosome (seven chromosomes), and the other daughter cell would be missing a chromosome (five chromosomes). As each of these initial two daughter cells entered meiosis II, the sister chromatids would separate normally in anaphase II resulting in two cells having seven chromosomes and two cells having five chromosomes at the end of meiosis.

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Incorrect. If a single pair of homologous chromosomes failed to separate in anaphase I, one of the daughter cells would inherit an extra chromosome (seven chromosomes), and the other daughter cell would be missing a chromosome (five chromosomes). As each of these initial two daughter cells entered meiosis II, the sister chromatids would separate normally in anaphase II resulting in two cells having seven chromosomes and two cells having five chromosomes at the end of meiosis.