Multiple Choice
During which phase of meiosis do sister chromatids separate from each other?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During meiosis, in which phase does crossing over (genetic recombination between homologous chromosomes) occur?
A
Prophase I (specifically during pachytene)
B
Telophase I
C
Metaphase I
D
Anaphase 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 genetic 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, forming structures called tetrads or bivalents, which is essential for crossing over to occur.
Recognize that crossing over specifically happens during the pachytene substage of Prophase I, when the synaptonemal complex is fully formed and facilitates the exchange of genetic segments.
Conclude that other phases such as Telophase I, Metaphase I, and Anaphase II do not involve the physical exchange of genetic material but are involved in chromosome alignment and separation.
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