Multiple Choice
What is the end result of meiosis II in a typical diploid organism?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During which phase of meiosis does crossing over (homologous recombination) occur?
A
Metaphase I
B
Anaphase I
C
Prophase I (specifically during synapsis/pachytene)
D
Prophase II
Verified step by step guidance1
Recall the stages of meiosis I and meiosis II, focusing on the events that characterize each phase.
Understand that crossing over, or homologous recombination, involves the exchange of genetic material between homologous chromosomes, which requires them to be paired closely together.
Identify that homologous chromosomes pair up during Prophase I, specifically in the substage called pachytene, where synapsis occurs and crossing over takes place.
Note that Metaphase I involves alignment of homologous pairs at the metaphase plate, but crossing over has already occurred by this point.
Recognize that Anaphase I and Prophase II do not involve crossing over, as chromosomes are either being separated or meiosis II is preparing to separate sister chromatids.
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