Multiple Choice
During Anaphase I of meiosis, which structures are separated and pulled toward opposite poles of the cell?
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9. Mitosis and Meiosis
Meiosis
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During which stage of meiosis does chromosomal exchange (crossing over) primarily occur?
A
Prophase I
B
Metaphase II
C
Telophase I
D
Anaphase I
Verified step by step guidance1
Recall that meiosis consists of two main divisions: Meiosis I and Meiosis II, each with distinct stages (Prophase, Metaphase, Anaphase, Telophase).
Understand that crossing over, or chromosomal exchange, involves the physical exchange of genetic material between homologous chromosomes, increasing genetic diversity.
Identify that crossing over occurs when homologous chromosomes pair up and form structures called tetrads, allowing for the exchange of genetic segments.
Recognize that this pairing and exchange happen during Prophase I of Meiosis I, where homologous chromosomes undergo synapsis and crossing over.
Conclude that the stage during which chromosomal exchange primarily occurs is Prophase I, before the chromosomes align at the metaphase plate.
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