Multiple Choice
During metaphase I of meiosis, what is the key chromosomal event that occurs at the metaphase plate?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During which phase of meiosis does crossing over between homologous chromosomes occur?
A
Metaphase I
B
Prophase I (specifically during pachytene)
C
Anaphase I
D
Prophase II
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 is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over occurs when homologous chromosomes are paired closely together, which happens during prophase I of meiosis.
Recognize that within prophase I, crossing over specifically takes place during the pachytene substage, when the synaptonemal complex is fully formed and chromatids are tightly paired.
Conclude that crossing over does not occur during metaphase I, anaphase I, or prophase II, as these phases involve chromosome alignment, separation, or preparation for meiosis II, respectively.
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