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BIOL 3040 Problem Set, Spring 2012 1 BIOL 3040 TAKE-HOME PROBLEM SET DUE Monday April 23rd, 2012 (at the beginning of class) The rules: Your answers...

question 1: is the genotype in hardy-weinberg equilibrium in each population? what is the relative fitness,selection coefficients, and genotype in the two population? why is the expected change in allele frequency different at the two sites?what two assumption and leaf morph expected in the next generation of adults from the fire of 2006?
BIOL 3040 Problem Set, Spring 2012 1 BIOL 3040 TAKE-HOME PROBLEM SET DUE Monday April 23 rd , 2012 (at the beginning of class) The rules: Your answers should be neatly written; typed would be nice (especially if your penmanship is like mine you know who you are!). In order to receive full credit for your responses, it is essential that you fully present your calculations and thought processes in a logical, incisive, and coherent manner. In other words, show your work ... otherwise I can’t tell whether you completely understand the proble m and its solution. If you solve the problem using formulae that were presented in lecture, handouts, discussion, or the text, you do not have to re-derive the formulae, but DO write the pertinent formulae down. In many cases, you will have to make some simplifying assumptions in solving the problems. If so, be sure to state your assumptions clearly . WHAT TO HAND IN: Do not hand in the question sheets. Hand in answers clearly written or typed to each question, and make sure it is clear what question you are answering. Staple all pages together and clearly write your name on each page (include student ID# on page 1 of your answers). Note that figures for question #2 must be prepared using Microsoft Excel or some other plotting software hand-drawn graphs will not be accepted. While I encourage you to discuss strategies and tactics for answering these problems with your fellow students, THE SOLUTIONS AND INTERPRETATIONS MUST BE ENTIRELY YOUR OWN . Please note that in problems of this kind, it is embarassingly easy for me to identify excessive cooperation and/or plagiarism. If you have any questions about what “too far” is in this context, ask me. Although I encourage you to use the Moodle discussion board if you are having problems with some of the concepts and approaches, I will not tolerate swapping of answers across the discussion board either soliciting specific answers to problems or sending them. Late assignments will be penalized 10% per day, and late assignments will not be accepted for grading after lecture on Wednesday April 25 th .
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BIOL 3040 Problem Set, Spring 2012 2 TOTAL POINTS = 43 QUESTION #1 [13 points] You have realized your life’s dream: you are a Nature Conservancy biologist earning a corporate executive’s salary studying redwood sorrel ( Oxalis oregana ) during the summer in the coastal forests of California. Redwood sorrel is an understory herb adapted for low-light, moist environments. Its leaves are among the favored delicacies of slugs (and other understory herbivores), and some humans believe that they have mysterious curative powers. In the two parks you are monitoring, rangers are conducting controlled burns about every five years to encourage the establishment of redwood seedlings. These relatively cool ground fires kill living O. oregana plants, but not their seeds , which readily germinate on the soil layers exposed by burning. Redwood sorrel populations are polymorphic for leaf pattern: seedlings and adults display one of the three leaf pattern phenotypes. Your greenhouse studies have shown that a single gene (L) with two alleles (L 1 and L 2 ) control the leaf polymorphism. You begin a study of two O. oregana populations (Rattler Flats and Bear Wallow) just after burns were conducted in 2000. You searched exhaustively through each burn area, and you counted new redwood sorrel seedlings and characterized their leaf patterns as follows: ________________________________________________________________________ S ITE S EEDLING G ENOTYPE Rattler Flats Bear Wallow ________________________________________________________________________ L 1 L 1 8332 24 L 1 L 2 875 830 L 2 L 2 23 7907 ________________________________________________________________________ Another burn was planned for Summer 2006, so in October 2005 you returned to both sites and re-surveyed surviving redwood sorrel plants, which are now reproductively mature. Your 2005 survey of adult genotypes is summarized below: ________________________________________________________________________ S ITE A DULT G ENOTYPE Rattler Flats Bear Wallow ________________________________________________________________________ L 1 L 1 3969 13 L 1 L 2 630 655 L 2 L 2 20 7562 ________________________________________________________________________
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