F09_315_Exam-2_Key-3 - Name _ BIOLOGY 315 Fall 2009 Second...

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1 BIOLOGY 315 Fall 2009 Second Midterm Examination Before you do anything else , please: check to make certain that your copy of the exam is complete, 10 total pages. print your name legibly in the space provided at the top of each page. The test makers were expecting the answer (C), but in fact (A) is correct — the shapes fit together to produce a surprisingly simple object with only five faces. This is easiest to see if you imagine two square pyramids side by side: The tetrahedron fits precisely between them to make a smooth-sided “pup tent”. Name __________________________
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2 1. A. Consider the pedigree below. What is the most likely mode of inheritance? 5 points Sex-linked recessive. Males only, skips generations. B. Based on your answer in part A, how would you explain the affected individual: V-6? 5 points The female (IV-7) is heterozygous. V-6 inherited the trait from the mother. It is possible that the father had a non-disjunction episode and so, the son is a Kleinfelter male. However, this is not complete. Since it is a recessive trait, then the other X would compensate as in females. 10 points Name __________________________
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3 2. Twenty year old Christopher Chiasm learns that his mother is developing the signs of a genetic disorder which runs in her family. This disorder results from a dominant allele of an X-linked gene. Individuals carrying that allele do not manifest the disease condition until they reach 40-50 years of age, so Christopher has no way of knowing whether or not he carries the disease allele. A. Christopher and his wife Isabelle would like to have children. There is no history of this disease in Isabelle's family, nor in the family of Christopher's father. If they do have a son, what is the probability that their son will inherit this genetic disease? Zero. Christopher would not pass an X chromosome to a son. 5 points B. What is the probability that a daughter would inherit this genetic disease? 0.5 Assume that Christopher’s mother is heterozygous for this rare dominant allele. If Christopher has the allele, he will pass it to all his daughters. 5 points 10 points Name __________________________
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4 3. Chauncey the gardener discovers a species of attractive multicolored wildflower in the woods behind his house, and decides to raise it in his garden. Over several generations he manages to generate two purebreeding strains, one that has pink flowers and one that has white flowers. When Chauncey crosses the pink-flowered strain and the white-flowered strain, the
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This note was uploaded on 09/12/2010 for the course BIO 315H taught by Professor Payne during the Spring '08 term at University of Texas at Austin.

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F09_315_Exam-2_Key-3 - Name _ BIOLOGY 315 Fall 2009 Second...

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