Multiple Choice
What occurs during prophase I of meiosis?
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12. Meiosis
Introduction to Meiosis
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During which stage of Prophase I does crossing over take place?
A
Zygotene
B
Diplotene
C
Pachytene
D
Leptotene
Verified step by step guidance1
Understand that Prophase I is a stage of meiosis where homologous chromosomes pair and exchange genetic material.
Recognize that Prophase I is divided into several sub-stages: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis.
Recall that crossing over, the exchange of genetic material between homologous chromosomes, occurs during the Pachytene stage.
During Pachytene, the synaptonemal complex is fully formed, allowing homologous chromosomes to be closely aligned, facilitating crossing over.
Crossing over is crucial for genetic diversity, as it results in new combinations of alleles on each chromosome.
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