Multiple Choice
Meiosis is a process that produces which of the following outcomes?
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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, which include Meiosis I and Meiosis II, each with their own subphases: Prophase, Metaphase, Anaphase, and Telophase.
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 of Meiosis I, specifically in the pachytene stage, when homologous chromosomes are tightly paired (synapsed).
Note that Prophase II occurs in Meiosis II and does not involve homologous chromosome pairing or crossing over.
Conclude that the correct phase for crossing over is Prophase I, not Prophase II, Anaphase I, or Metaphase I.
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