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2011 Unit I Exam-A Spr12 KEY

2011 Unit I Exam-A Spr12 KEY - BSC 2011 UNIT I EXAM FORM A...

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BSC 2011 UNIT I EXAM - FORM A Spring 2012 Name, please: _____ ANSWERS AT THE END _________ DIRECTIONS: Please bubble in the letter of the single best choice for each question on your scantron. Then please write your name on the last page of this exam, tear off that page, and write your essay. 1. Cytoplasmic determinants are coded for by _____. A. segmentation genes B. maternal effect genes C. segment-polarity genes D. pair-rule genes E. gap genes 2. A mutation in a Hox gene would affect what part of a developing embryo? 3. What might be a possible result if the notochord of an embryo is unable to synthesize inductive signals? 4. What might you expect if bicoid protein is injected into cells at opposite ends of an early fruit-fly embryo? A. an embryo with two neural tubes B. an embryo with no neural tube C. an embryo with two dorsal lips C. an embryo with two ventral sides C. an embryo with two anterior ends 5. A change in ______ expression is one reason why cells ingress in a sea urchin embryo. 6. Which of the following has contributed to large morphological changes as organisms have evolved? A. Hox gene duplication B. heterochrony C. homeobox mutations D. choices A and B only E. choices A, B and C apply 7. What type of embryonic cells most directly assist in the formation of vertebrae? 8. Which of the following is correctly paired? 9. Which is not an example of embryonic cell movement? 10. The cortical rotation is important for what reason? A. placement of dorsal features B. egg & sperm recognition C. fertilization envelope formation D. limb bud formation E. placement of anterior features 11. What allows a protein like bicoid to regulate one set of genes in one cell and a different set of genes in another cell?
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