Scelta multipla
Meiosis results in which of the following outcomes?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
Crossing over (homologous recombination) occurs during which stage of meiosis?
A
Metaphase I
B
Anaphase I
C
Prophase II
D
Prophase I (specifically the pachytene stage)
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Recall the stages of meiosis I: Prophase I, Metaphase I, Anaphase I, and Telophase I, followed by meiosis II stages.
Understand that crossing over, or homologous recombination, is the process where homologous chromosomes exchange genetic material to increase genetic diversity.
Identify that crossing over occurs during Prophase I, when homologous chromosomes pair up closely in a process called synapsis.
Focus on the pachytene stage of Prophase I, which is when the physical exchange of chromosome segments (crossing over) actually takes place.
Conclude that crossing over does not occur during Metaphase I, Anaphase I, or Prophase II, but specifically during Prophase I (pachytene stage).
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