Lab 24 and 25 practical review

Lab 24 and 25 practical review - Abstinence: 100% effective...

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Unformatted text preview: Abstinence: 100% effective Sterilization: 99.9% effective › Vasectomy and Tubal ligation Hormonal Methods prevent ovulation › Birth control pill, Depo­provera, Ortho Patch, vaginal ring, contraceptive implant › Release estrogen and/or progesterone › 99% effective Barrier Methods prevent sperm and egg from meeting › Condoms, Diaphragm and spermicide › 94% effective Methods that prevent implantation: › IUD: 99% effective › Plan B or “morning after pill”: 80% effective Rhythm method (natural family planning) › 80% effective Starfish Development Models Early cleavage stage embryos (2,4, and 8 cell stages) Early cleavage stage embryos (2,4, and 8 cell Early Starfish Development Females and males shed their gametes into water where fertilization occurs. These slides contain a mixture of all of the various embryonic stages in whole mounts. Before sperm penetration of the egg occurs, the nucleus and a single nucleolus are clearly visible in the unfertilized egg cell. Label: nucleus, nucleolus, nuclear membrane, cytoplasm Fertilized egg: Once the sperm penetrate the egg, the egg cell (which was actually a secondary oocyte) completes meiosis. The nucleus will no longer be visible. A fertilization membrane is formed, which prevents any other sperm cells from entering the egg. Label: Fertilization membrane Early cleavage stage embryo (2,4, and 8 cell stages) Late gastrula Label: Blastocoel, archenteron, blastopore, ectoderm, endoderm, & mesoderm.. 36 37 ...
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Lab 24 and 25 practical review - Abstinence: 100% effective...

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