biology_frq_03 - AP® Biology 2003 Free-Response Questions...

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Unformatted text preview: AP® Biology 2003 Free-Response Questions The materials included in these files are intended for use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities for noncommercial, face-to-face teaching purposes. This permission does not apply to any third-party copyrights contained herein. This material may not be mass distributed, electronically or otherwise. These materials and any copies made of them may not be resold, and the copyright notices must be retained as they appear here. These materials were produced by Educational Testing Service® (ETS®), which develops and administers the examinations of the Advanced Placement Program for the College Board. 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For the College Board’s online home for AP professionals, visit AP Central at 2003 AP® BIOLOGY FREE-RESPONSE QUESTIONS BIOLOGY SECTION II Time—1 hour and 30 minutes Directions: Answer all questions. Answers must be in essay form. Outline form is not acceptable. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before you begin to write. Write all your answers on the pages following the questions in the pink booklet. 1. In fruit flies, the phenotype for eye color is determined by a certain locus. E indicates the dominant allele and e indicates the recessive allele. The cross between a male wild-type fruit fly and a female white-eyed fruit fly produced the following offspring. Wild-type Male F1 Wild-type Female White-eyed Male White-eyed Female Brown-eyed Female 0 45 55 0 1 The wild-type and white-eyed individuals from the F1 generation were then crossed to produce the following offspring. F2 23 31 22 24 0 (a) Determine the genotypes of the original parents (P generation) and explain your reasoning. You may use Punnett squares to enhance your description, but the results from the Punnett squares must be discussed in your answer. (b) Use a Chi-squared test on the F2 generation data to analyze your prediction of the parental genotypes. Show all your work and explain the importance of your final answer. (c) The brown-eyed female in the F1 generation resulted from a mutational change. Explain what a mutation is, and discuss two types of mutations that might have produced the brown-eyed female in the F1 generation. Copyright © 2003 by College Entrance Examination Board. All rights reserved. Available to AP professionals at and to students and parents at GO ON TO THE NEXT PAGE. 2 2003 AP® BIOLOGY FREE-RESPONSE QUESTIONS Critical Values of the Chi-Squared Distribution Degrees of Freedom (df) Probability (p) 1 3.84 0.05 2 5.99 3 7.82 The formula for Chi-squared is: X 2=Ê 4 9.49 5 11.1  (o - e)2 "# !e$ where o = observed number of individuals e = expected number of individuals ∑= the sum of the values (in this case, the differences, squared, divided by the number expected) 2. Regulatory (control) mechanisms in organisms are necessary for survival. Choose THREE of the following examples and explain how each is regulated. (i) Flowering in plants (ii) Water balance in plants (iii) Water balance in terrestrial vertebrates (iv) Body temperature in terrestrial vertebrates Copyright © 2003 by College Entrance Examination Board. All rights reserved. Available to AP professionals at and to students and parents at GO ON TO THE NEXT PAGE. 3 2003 AP® BIOLOGY FREE-RESPONSE QUESTIONS 3. Many populations exhibit the following growth curve: (a) Describe what is occurring in the population during phase A. (b) Discuss THREE factors that might cause the fluctuations shown in phase B. (c) Organisms demonstrate exponential (r) or logistic (K) reproductive strategies. Explain these two strategies and discuss how they affect population size over time. 4. Death is a natural and necessary part of life cycles at all levels of organization. (a) Discuss TWO examples of how cell death affects the development and functioning of a multicellular organism. (b) Discuss ONE example of how substances are degraded and reused in cells. (c) Discuss the evolutionary significance of death. END OF EXAMINATION Copyright © 2003 by College Entrance Examination Board. All rights reserved. Available to AP professionals at and to students and parents at GO ON TO THE NEXT PAGE. 4 ...
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This note was uploaded on 11/23/2009 for the course BIOLOGY 1101 taught by Professor Keith during the Winter '05 term at The University of Oklahoma.

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