Multiple Choice
What is crossing over and during which phase of meiosis does it occur?
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12. Meiosis
Introduction to Meiosis
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In which phase of meiosis does crossing over occur?
A
Prophase I
B
Anaphase I
C
Telophase I
D
Metaphase 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.
Recognize that crossing over is a process where homologous chromosomes exchange genetic material. This increases genetic diversity in the resulting gametes.
Identify that crossing over occurs during Prophase I of Meiosis I. During this phase, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
Note that the physical exchange of chromosome segments occurs at points called chiasmata, which are visible under a microscope during Prophase I.
Remember that crossing over is a key event that distinguishes Prophase I from other phases of meiosis, such as Metaphase I, Anaphase I, and Telophase I, where no crossing over occurs.
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