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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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Related Experiment Video

Updated: Jul 7, 2026

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

Published on: March 6, 2018

Bisphenol A exposure disrupts egg development in the mouse

Martha Susiarjo¹, Patricia Hunt

¹School of Molecular Biosciences and Center for Reproduction, Washington State University, Pullman, Washington 99164-4460, USA.

Fertility and Sterility

|March 20, 2008

Summary

No abstract available in PubMed .

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