Multiple Choice
In meiosis, how many rounds of cell division occur to produce haploid gametes from a diploid germ cell?
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17. Meiosis and Sexual Reproduction
Meiosis
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In which of the following steps of prophase I does crossing over occur?
A
Leptoene
B
Zygotene
C
Pachytene
D
Diplotene
E
Diakinesis
Verified step by step guidance1
Understand the context of prophase I in meiosis, which is a stage where homologous chromosomes pair and exchange genetic material.
Recall that prophase I is divided into several sub-stages: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis.
Recognize that crossing over, the process where homologous chromosomes exchange genetic material, is a key event in genetic diversity.
Identify that crossing over specifically occurs during the Pachytene stage of prophase I.
Note that during Pachytene, the synaptonemal complex is fully formed, allowing for the exchange of genetic material between homologous chromosomes.
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