Multiple Choice
During which phase of meiosis does the process of crossing over occur?
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12. Meiosis
Introduction to Meiosis
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Crossing over would most likely occur during which stage of meiosis?
A
Prophase I
B
Telophase I
C
Metaphase I
D
Anaphase 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. It consists of two stages: Meiosis I and Meiosis II.
Recall that crossing over is a process where homologous chromosomes exchange genetic material. This increases genetic diversity in gametes.
Identify that crossing over occurs during Prophase I of Meiosis I. During this stage, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
Recognize that the physical exchange of chromosome segments between non-sister chromatids occurs at points called chiasmata during Prophase I.
Conclude that Prophase I is the stage where crossing over is most likely to occur, as it is the only stage where homologous chromosomes are closely paired and can exchange genetic material.
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