Exam_4 - Name_KEY BIOLOGY 325H Genetics Spring 2008 Final...

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Name _______KEY ___________ 1 BIOLOGY 325H Genetics Spring 2008 Final Examination (160 points) Before you do anything else , please: check to make certain that your copy of the exam is complete, i.e. 9 pages. print your name legibly in the space provided at the top of each page. 1. [15 pts] You’re working with a plant that is not a model organism, Deloviliana priklianus , so its genome has not been sequenced. Nonetheless you think it will be ideal for learning about the genetics of spines. You’ve already created a genetic map of D. priklianus so you have a lot of genetic markers, approximately 1 every 10 centiMorgans. Now you want to use a set of RILs to determine the parts of the chromosomes where the genes for spines are located. A . What does RIL stand for and how might you produce your own set of them for your species? Assume your species has hermaphroditic flowers and is self-compatible. Also assume you have four potential parents from which you can pick only two. Explain why you pick the parents that you do. Parent 1: long wide spines Parent 2: long thin spines Parent 3: short wide spines Parent 4: medium thin spines B . You’ve produced your RILs, what sort of patterns will you look for to determine the chromosomal locations of genes responsible for different types of spines?
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Name _______KEY ___________ 2 2. [20 pts] D. priklianus grows in a forested environment where global climate change is expected to increase the temperature and decrease the average amount of precipitation. The decreased precipitation will reduce other food resources for its main herbivore, rabbits, so herbivory on D. priklianus will increase. One possible evolutionary response to increased herbivory would be for selection to increase the number of spines/cm 2 ; however, selection for increased spine density also increases the number of stomata on the plant’s leaves. A . Explain a genetic mechanism that might account for the relationship between the number of stomata and spine density. B . D. priklianus is a C 3 plant. Given the expected changes in the environment due to climate change, what will likely happen evolutionarily if selection starts acting to increase the number of spines? Be as specific as you can about what will happen and why, i.e., will there be tradeoff between spines and stomata; will selection favor both increased spine density and stomatal number; will something else happen? C
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Exam_4 - Name_KEY BIOLOGY 325H Genetics Spring 2008 Final...

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