Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
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• before birth in mammals.<br />
• prior to the onset of meiosis I, the DNA replicates<br />
• start of prophase I crossing-over occurs between nonsister chromatids<br />
• arrested after diplotene of prophase I<br />
• primary oocytes synthesize a coat <strong>and</strong> cortical granules.<br />
• intensive biosynthetic activities<br />
• progress through meiosis I.<br />
• replicated homologous chromosomes segregate at anaphase I<br />
• a small polar body <strong>and</strong> a large secondary oocyte
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