Multiple Choice
In sexually reproducing animals, where does meiosis primarily occur?
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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
Prophase I (specifically during pachytene)
C
Anaphase I
D
Metaphase I
Verified step by step guidance1
Recall the stages of meiosis I and meiosis II, focusing on the 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 requires homologous chromosomes to pair up closely, a process called synapsis, which occurs during prophase I of meiosis.
Recognize that within prophase I, crossing over specifically happens during the pachytene substage, when the synaptonemal complex is fully formed and chromatids exchange segments.
Conclude that crossing over does not occur during prophase II, anaphase I, or metaphase I, because these phases either lack homolog pairing or the conditions necessary for recombination.
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