Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
Meiosis, Germ Cells, and Fertilization
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Sperm Are Produced Continuously in the<br />
Mammalian Testis<br />
• Seminiferous tubules<br />
– epithelial lining of very long, tightly coiled<br />
tubes<br />
• Spermatogonia (singular,<br />
spermatogonium)<br />
– Immature germ cells<br />
– Stem cells - divide slowly by mitosis<br />
• Primary spermatocytes<br />
• <strong>Meiosis</strong> I<br />
• Secondary spermatocytes<br />
– 22 duplicated autosomal chromosomes<br />
– a duplicated X or Y chromosome<br />
• <strong>Meiosis</strong> II<br />
• Spermatids
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