FINAL KEY

FINAL KEY - BICD 130 - Embryos, Genes, and Development...

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BICD 130 — Embryos, Genes, and Development Summer 2007 Final Exam (Five parts, 170 points total) ANSWER KEY ______________________________________________________ Please PRINT your name here Please write your answers in ink. Requests for regrades will not be considered for exams done in pencil. EXAM TIP: Be sure to read the entire question carefully, and let the question’s point value and the provided space guide you as to how in-depth your answer should be. Part I ( 23 pts.)_________________________ Part II (58 pts.)__________________________ Part III (52 pts.)__________________________ Part IV (16 pts.)_________________________ Part V ( 21 pts.)_________________________ Bonus (9 pts)___________________________
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2 Part 1: Fertilization, Cleavage, Early Development in Drosophila (23 points) 1. Which of the following is NOT the characteristic(s) of a mammalian sperm? (3 points) I. Lack significant amount of cytoplasm II. Haploid chromosomal content III. Must undergo capacitation before fusion with the egg IV. Release of cortical granules to penetrate through cumulus/zona pellucida layers V. None of the above 2. Consider and choose the correct statement in regards to fertilization: (3 points) a) The two mechanisms that prevent polyspermy for most species, including mammals, are 1) change in resting potential and 2) release of cortical granules b) Neither the egg nor the sperm is the “active” or “passive” partner because both activate one another in the process of fertilization c) Neither statement from above is correct d) Both statements from above are correct 3. Upon fertilization, which of the following changes triggers protein synthesis, DNA replication, and cytoplasmic movements of morphogenetic materials? (3 points) I. Increase in intracellular calcium concentration II. Decrease in intracellular calcium concentration III. Increase in intracellular pH IV. Decrease in intracellular pH a) I, III b) I, IV c) II, III d) II, IV e) None of the choices above 4. Consider and choose the correct statement with regards to cleavage: (3 points) a. Mammals undergo holoblastic cleavage, which means incomplete cleavage b. Degradation of cyclin B is required for cells to enter the mitotic phase c. Neither statement from above is correct d. Both statements from above are correct 5. Which of the following events promote ventralization in Drosophila embryo? (3 points) I. Production of Pipe by follicle cells II. Activation of Toll Receptor III. Formation of Dorsal-Cactus complex a) I, II b) I, III c) II, III d) All of the above
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3 6. Consider and choose the correct statement in regards to Drosophila development: (3 points) a. The transcription of different pair-rule genes results in a pattern of seven transverse stripes perpendicular to the anterior-posterior axis b. The transcription of different segment polarity genes results in the division of embryo into fourteen segments c. Neither statement from above is correct d. Both statements from above are correct
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FINAL KEY - BICD 130 - Embryos, Genes, and Development...

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