Multiple Choice
Crossing over occurs during which stage of meiosis?
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12. Meiosis
Introduction to Meiosis
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At what point does the secondary oocyte complete meiosis?
A
At the onset of puberty
B
During ovulation
C
Upon fertilization by a sperm cell
D
During the formation of the primary follicle
Verified step by step guidance1
Understand the process of oogenesis, which is the development of the female gametes or ova. It begins with the formation of primary oocytes during fetal development.
Recognize that primary oocytes are arrested in prophase I of meiosis until puberty. At puberty, hormonal changes trigger the continuation of meiosis.
During each menstrual cycle, a primary oocyte completes meiosis I to form a secondary oocyte and a polar body. The secondary oocyte is arrested in metaphase II.
Identify that ovulation involves the release of the secondary oocyte from the ovary. However, it remains arrested in metaphase II until fertilization.
Upon fertilization by a sperm cell, the secondary oocyte completes meiosis II, resulting in the formation of a mature ovum and another polar body.
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