Scelta multipla
In sexually reproducing eukaryotes, meiosis results in the production of which of the following?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
During which stage of meiosis does crossing over between homologous chromosomes occur?
A
Anaphase I
B
Metaphase I
C
Prophase I (specifically during pachytene)
D
Prophase II
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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 is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over occurs during Prophase I, which is subdivided into leptotene, zygotene, pachytene, diplotene, and diakinesis stages.
Focus on the pachytene stage of Prophase I, where homologous chromosomes are fully synapsed and crossing over takes place.
Conclude that crossing over does not occur during Metaphase I, Anaphase I, or Prophase II, but specifically during Prophase I (pachytene).
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