Multiple Choice
In which stage of meiosis does crossing-over occur?
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12. Meiosis
Introduction to Meiosis
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During which phase of meiosis does crossing over occur?
A
Metaphase I
B
Anaphase I
C
Prophase I
D
Telophase I
Verified step by step guidance1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell.
Recall that meiosis consists of two consecutive divisions: Meiosis I and Meiosis II, each with its own phases: Prophase, Metaphase, Anaphase, and Telophase.
Focus on Prophase I of Meiosis I, where homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
Recognize that during Prophase I, crossing over occurs, which is the exchange of genetic material between non-sister chromatids of homologous chromosomes, leading to genetic variation.
Remember that crossing over is a key event in Prophase I, distinguishing it from other phases like Metaphase I, Anaphase I, and Telophase I, where crossing over does not occur.
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