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 is a secondary oocyte arrested?
A
Prophase I
B
Metaphase I
C
Anaphase II
D
Metaphase II
Verified step by step guidance1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in the production of gametes or sex cells.
Recall that meiosis consists of two stages: Meiosis I and Meiosis II, each with its own phases: Prophase, Metaphase, Anaphase, and Telophase.
In the context of oogenesis (the formation of egg cells), the primary oocyte is arrested in Prophase I until puberty.
Once ovulation begins, the primary oocyte completes Meiosis I to form a secondary oocyte and a polar body. The secondary oocyte then begins Meiosis II.
The secondary oocyte is arrested in Metaphase II and will only complete Meiosis II if fertilization occurs, leading to the formation of an ovum and another polar body.
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