Multiple Choice
In sexually reproducing organisms, the primary purpose of meiosis is to produce which of the following?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During meiosis I, during which substage does crossing over between homologous chromosomes occur?
A
Anaphase I
B
Telophase I
C
Prophase I (specifically pachytene)
D
Metaphase I
Verified step by step guidance1
Recall the stages of meiosis I: Prophase I, Metaphase I, Anaphase I, and Telophase I.
Understand that crossing over is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over occurs during Prophase I, when homologous chromosomes pair up closely in a process called synapsis.
Within Prophase I, recognize that crossing over specifically happens during the pachytene substage, where the synaptonemal complex is fully formed and chromatids exchange segments.
Conclude that crossing over does not occur during Metaphase I, Anaphase I, or Telophase I, but specifically during Prophase I (pachytene).
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