Multiple Choice
During Meiosis I, what specifically separates?
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12. Meiosis
Meiosis I
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During which stage of meiosis I is crossing over most likely to occur?
A
Anaphase I
B
Telophase I
C
Prophase I
D
Metaphase I
Verified step by step guidance1
Understand the concept of crossing over: Crossing over is the exchange of genetic material between homologous chromosomes, which increases genetic diversity. This process occurs during meiosis, specifically in meiosis I.
Recall the stages of meiosis I: Meiosis I consists of Prophase I, Metaphase I, Anaphase I, and Telophase I. Each stage has distinct events that contribute to the separation of homologous chromosomes.
Focus on Prophase I: During Prophase I, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads. This close pairing allows crossing over to occur.
Understand why crossing over occurs in Prophase I: The physical proximity of homologous chromosomes during synapsis enables the exchange of genetic material at specific points called chiasmata. This process does not occur in later stages because the chromosomes are no longer paired closely.
Conclude that crossing over is most likely to occur during Prophase I, as this is the stage where homologous chromosomes are aligned and prepared for genetic exchange.
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