Lec40s - Gametogenesis, Fertilization, and Early...

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Gametogenesis, Fertilization, and Early Development Chapter 46 6 th ed.: 984-986 7 th : 973-975 8 th ; scanned pgs. 974-5 Chapter 47 6 th : 999-1006; 1010-1011 7th: 988-996; 999-1000 8 th :1021-3;1025-30,33,34
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Development How to get from here (zygote) to here? (This week’s lectures.)
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Today : How are gametes formed? How does fertilization occur? What are the early steps of animal development?
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Gametogenesis : Formation of gametes Spermatogenesis : Sperm formation Oogenesis : Egg (ovum) formation
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Spermatogenesis: occurs in seminiferous tubules: tightly packed in testes a seminiferous tubule
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Immature cells are at the outside of the tubule wall. They move inward as they mature. Mature sperm are releas- ed into the tubule lumen.
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Meiosis occurs in de- veloping sperm as the cells move inward.
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Ovary: where eggs form. Contains follicles: layers of cells surround- ing each egg. developing follicles
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Ovulation: Each month, 1 egg bursts from follicle; released into oviduct.
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(haploid)
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One secondary oocyte is released at ovulation. ovulation
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Meiosis II is only completed when sperm enters.
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Fertilization: fusion of 2 haploid gametes to give a diploid zygote.
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the oviduct. Zygote moves to uterus for implantation. * * = fertilization
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Lec40s - Gametogenesis, Fertilization, and Early...

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