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Unformatted text preview: Each month, approximately 1000 primary oocytes will to mature but most will die. Ovulation occurs approximately once every 28 days. Females ovulate approximately 400 times during their lifetime. Secondary oocytes are released at ovulation. The second meiotic division resumes after penetration by sperm. In humans, secondary oocytes are fertilized. Eggs are produced only after fertilization of a secondary oocyte. In the diagram above, the first polar body produced after the first meiotic division did not divide again. Women are born with all of the primary oocytes that they will ever have (2 million). At puberty, there are approximately 400,000 left. Some chromosomal abnormalities associated with maternal age may be due to the long time they remain paired during prophase I....
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- Fall '10
- Biology, meiotic division, oocyte, secondary oocyte, polar body, Ruptures