chapter26c Reproduction and Development 3

chapter26c Reproduction and Development 3 - Chapter 26c...

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Chapter 26c Reproduction and Development
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Pregnancy Prevention Contraceptives (birth control methods) Abstinence Total abstinence Abstinence during periods of female fertility Interventional methods Barriers Surgery Blocking implantation Hormone treatments to reduce gamete production
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Pregnancy Prevention Table 26-5
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Fertilization Sperm capacitation occurs in vagina Sperm swim “upstream” Sperm reach oocyte in Fallopian tube Acrosomal reaction  digestive enzymes Zona pellucida and cell junctions dissolve Membranes fuse and sperm nucleu enters Cortical reaction blocks polyspermy Nuclear fusion creates a diploid cell 1 sperm + 1 oocyte  1 zygote
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Fertilization Figure 26-16a
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Acrosome Reaction Allows Sperm to Reach Egg Figure 26-16b
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Sperm and Egg Fuse to Form a Zygote Figure 26-17 (1 of 4, 2 of 4) Sperm nucleus Sperm and egg plasma membranes fuse. Sperm nucleus moves into cytoplasm of egg. Egg First polar body
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Oocyte Completes Meiosis and Nuclei Fuse Figure 26-17 (3 of 4, 4 of 4) Oocyte nucleus completes meiotic division. Egg Sperm and egg nuclei fuse to form zygote nucleus. Second polar body Sperm nucleus
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Early Development Rapid cell divisions follow fertilzation Blastocyst Hollow ball of ~ 100 cells Arrives in uterus on day 4 or 5 Implantation Blastocyst invades the endometrium
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Figure 26-18 Blastocyst Inner cell mass Days 5-9: Blastocyst implants. Ovulation
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This note was uploaded on 01/03/2012 for the course BIO 308 taught by Professor Acbrown during the Spring '10 term at Portland.

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chapter26c Reproduction and Development 3 - Chapter 26c...

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