Multiple Choice
How does a tetrad form during prophase I of meiosis?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
At what stage of meiosis does crossing over between homologous chromosomes occur?
A
Metaphase I
B
Prophase II
C
Anaphase I
D
Prophase I (specifically during pachytene of prophase I)
Verified step by step guidance1
Recall the stages of meiosis I: Prophase I, Metaphase I, Anaphase I, and Telophase I, and understand that crossing over occurs during one of these stages.
Understand that crossing over is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over specifically happens during Prophase I, when homologous chromosomes pair up tightly in a process called synapsis.
Recognize that within Prophase I, crossing over occurs during the pachytene substage, where the synaptonemal complex forms and facilitates the exchange of genetic segments.
Conclude that crossing over does not occur during Metaphase I, Anaphase I, or Prophase II, but specifically during Prophase I of meiosis.
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