Multiple Choice
During which stage of meiosis does crossing over typically occur?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
Multiple Choice
During which phase of meiosis does crossing over between homologous chromosomes occur?
A
Prophase II
B
Metaphase I
C
Anaphase I
D
Prophase I (specifically during pachytene)
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 is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over occurs during Prophase I of Meiosis I, specifically in the pachytene stage when homologous chromosomes are tightly paired.
Note that Prophase II, Metaphase I, and Anaphase I do not involve crossing over; Prophase II occurs in Meiosis II after the chromosomes have already been separated once.
Conclude that the correct phase for crossing over is Prophase I, as this is when homologous chromosomes synapse and exchange segments.
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