Multiple Choice
During anaphase II of meiosis, what is the key event that occurs in each cell?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During which phase of meiosis does crossing over (homologous recombination) occur?
A
Prophase II
B
Anaphase I
C
Metaphase I
D
Prophase I (specifically pachytene)
Verified step by step guidance1
Recall the stages of meiosis I and meiosis II, focusing on the key events that characterize each phase.
Understand that crossing over, or homologous recombination, involves the exchange of genetic material between homologous chromosomes, which increases genetic diversity.
Identify that crossing over occurs during meiosis I, specifically in prophase I, when homologous chromosomes pair up and form structures called tetrads.
Within prophase I, recognize the substage called pachytene, where the synaptonemal complex is fully formed and crossing over takes place.
Conclude that crossing over does not occur in prophase II, anaphase I, or metaphase I, but specifically during prophase I (pachytene).
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