Question

sort the following events into whether they occur in metaphase i/anaphase i of meiosis, in metaphase/anaphase of mitosis, or both. labels ① drop zones reset all a division of cytoplasm follows metaphase metaphase/anaphase i/anaphase i of of mitosis (2/3) meiosis (1/3) a telophase will follow homologous chromosomes separate from one another crossing over occurred just before the number of chromosomes will be reduced overall bivalents are formed both (3/3) centromeres will divide in two the number of chromosomes stays the same overall

Explanation:

1. a division of cytoplasm follows: In both meiosis and mitosis, cytokinesis (division of cytoplasm) follows the nuclear division events of anaphase and telophase.
2. a telophase will follow: After anaphase in both meiosis I and mitosis, telophase occurs to reform nuclei.
3. homologous chromosomes separate from one another: This is unique to anaphase I of meiosis. Homologous chromosomes pair up during prophase I and then separate during anaphase I.
4. crossing - over occurred just before: Crossing - over occurs during prophase I of meiosis and is a characteristic feature of meiosis, not mitosis.
5. the number of chromosomes will be reduced overall: This occurs in meiosis I. After anaphase I, the number of chromosomes in each daughter cell is reduced by half compared to the parent cell.
6. bivalents are formed: Bivalents (pairs of homologous chromosomes) are formed during prophase I of meiosis and are present in metaphase I, not in mitosis.
7. centromeres will divide in two: In mitosis, centromeres divide in anaphase to separate sister chromatids. In meiosis, centromeres do not divide in anaphase I but divide in anaphase II.
8. the number of chromosomes stays the same overall: In mitosis, the number of chromosomes in daughter cells is the same as in the parent cell. In meiosis I, the number of chromosomes is halved.

Answer:

• Metaphase I/anaphase I of meiosis: homologous chromosomes separate from one another, crossing - over occurred just before, the number of chromosomes will be reduced overall, bivalents are formed
• Metaphase/anaphase of mitosis: centromeres will divide in two, the number of chromosomes stays the same overall
• Both: a division of cytoplasm follows, a telophase will follow