Scelta multipla
During meiosis, how many times does a single diploid cell divide to produce haploid cells?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
In meiosis, during which stage does crossing over (genetic recombination between homologous chromosomes) occur?
A
Anaphase I
B
Prophase I (specifically during pachytene)
C
Prophase II
D
Metaphase I
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Recall the stages of meiosis I and meiosis II, focusing on the events that characterize each stage.
Understand that crossing over, or genetic recombination, involves the exchange of genetic material between homologous chromosomes, which increases genetic diversity.
Identify that crossing over occurs when homologous chromosomes pair up and form structures called tetrads, allowing for the exchange of segments.
Recognize that this pairing and exchange happen during Prophase I of meiosis, specifically in the pachytene substage when the synaptonemal complex is fully formed.
Conclude that crossing over does not occur during Anaphase I, Prophase II, or Metaphase I, but specifically during Prophase I (pachytene).
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