ex3_2006 - Name: _ Student ID:_ Page 1 Zoology 470 - Exam...

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Name: ______________________________________ Student ID:________________________ Page 1 Zoology 470 - Exam #3 – 2006 This exam has 7 pages and a total of 50 points . You will have 120 minutes to complete it. Answer all short answer questions as briefly as possible. Make sure your name and ID number are on all pages. 1. Provide concise definitions for each of the following ( 6 points ) a. nodal cilium: b. neuropore: c. chorionic villus biopsy (sampling): d. sclerotome: e. netrin: f. metamerism: 2. The unrestricted potency of cells in vertebrate embryos is an important feature of their early development. a. Neural crest cells and their progeny appear to be pluripotent. Describe one piece of evidence that neural crest cells are pluripotent ( 1 point ) b. Blastomeres in early mammalian embryos are totipotent, allowing for preimplantation genetic diagnosis (PGD). At what stage of early embryonic development is this procedure typically performed? ( 1 point )
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Name: ______________________________________ Student ID:________________________ Page 2 2 (cont) c. In PGD, material that possesses an undesirable genetic constitution is routinely discarded. You are called in to counsel a second family that thinks reproductive technologies are ethically permissible, but that is opposed to any procedure that results in intentional destruction of zygotes. Would this family be opposed to discarding either or both of the cells shown in the diagram? State your reasoning clearly ( 1 point ). 3. Circle true (T) or false (F) for each of the following ( 7 points ) T F In mammals, the chorion has lost its protective function and has been modified to form the placenta. T F The splanchnopleure is formed from the splanchnic mesoderm and ectoderm in vertebrates. T F The umbilical artery carries oxygenated blood from the placenta back to the fetal heart. T F Pigmented cells form from neural crest cells that migrate under the anterior half of somites. T F Many internal organs, such as the liver and pancreas, form from simple outpocketings of the ectoderm in amniotes. T F In vertebrates, the retina forms from neural ectoderm. T F Like amphibians, the floor of the blastocoel is initially lined with endoderm prior to gastrulation in amniotes. T F Keller explants indicate that "vertical" neural induction can occur in the central nervous system in vertebrates. T F
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This note was uploaded on 04/07/2009 for the course ZOO 470 taught by Professor Hardin during the Spring '08 term at Wisconsin.

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ex3_2006 - Name: _ Student ID:_ Page 1 Zoology 470 - Exam...

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