bild3_SP07_midtermKEY - 1 BILD3 Midterm May 4, 2007 Name_...

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1 BILD3 Midterm May 4, 2007 Dr. Wills 1 hour, 100 points total Name_________________ Section time____________ Calculators permitted, but only without cases. Read the questions carefully, and make sure that you answer all parts of each question. If diagrams are needed, make them clear and label them fully. This exam consists of 7 pages. Check to make sure you have them all. Write your name on each page. GRADER USE ONLY Question 1a,b ____________ 1c,d ____________ 1 e,f _____________ 2 a ______________ 2 b ______________ 2 c ______________ 3 a _____________ 3 b _____________ 4 a _____________ 4 b _____________ 5 _____________ Total ____________
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2 Name ___________________ 1. Briefly define (18 points): a) Ribosome -in the cell/organelle -responsible for protein synthesis/translation of mRNA -made of proteins and rna b) Ribozyme -RNA molecule -enzymatic properties/catalyst -"rna world" c) Mutation Mutation: Heritable change in the genetic material that occurs at random. d) Horizontal gene transfer Horizontal Gene Transfer: Genes cross from one branch of the tree of life to another, hop the species barrier. Can occur through mobile
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3 elements or fusion of cells. e) Founder effect A new population established by a small number of individuals that carries only a part of the old population's genetic variation. I also looked for any kind of mention that the alleles/traits of the founders may widely found in the new population. f) Runaway sexual selection Sexual selection with certain sexes preferring the more extreme characteristics of the opposite sex. This selection would continue until it is checked by other selective forces. Name _________________ 2. You journey on a scientific expedition to the jungle-covered mountains at the center of the island of Borneo, and there you discover two new kinds of Drosophila fruit flies. You name them after the sponsors of your trip, D. rockefellerii and D. billgatesii . The two types of fly are morphologically distinct, and they can easily be raised in the laboratory. a) Back in your laboratory in America, you put individual virgin females of D. rockefellerii in bottles along with one D. rockefellerii and one D. billgatesii male, and watch to see what happens. You repeat this experiment 20 times with different sets of flies each time, and the results are shown below: D. rockefellerii female mates with: Number of matings: D. rockefellerii male 17 D. billgatesii male
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bild3_SP07_midtermKEY - 1 BILD3 Midterm May 4, 2007 Name_...

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