Multiple Choice
During which stage of meiosis does crossing over between homologous chromosomes occur?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During prophase II of meiosis II, which of the following events occurs?
A
Sister chromatids separate at the centromere and move to opposite poles of the cell.
B
Chromosomes (each still consisting of two sister chromatids) re-condense, the nuclear envelope breaks down, and a new spindle apparatus begins to form in each haploid cell.
C
Homologous chromosomes pair (synapsis) and exchange segments through crossing over.
D
Homologous chromosome pairs (tetrads) align at the metaphase plate before being separated.
Verified step by step guidance1
Recall the stages of meiosis II, which include prophase II, metaphase II, anaphase II, and telophase II, occurring in haploid cells after meiosis I.
Understand that during prophase II, chromosomes condense again, the nuclear envelope breaks down, and the spindle apparatus forms; sister chromatids remain attached at this stage.
Recognize that sister chromatids separate at the centromere during anaphase II, not prophase II.
Note that homologous chromosomes pair and undergo crossing over during prophase I, not prophase II.
Remember that homologous chromosome pairs align at the metaphase plate during metaphase I, not during prophase II.
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