Sample+MT+I+questions (1)

Sample+MT+I+questions (1) - Biological Sciences 101 Dr....

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Biological Sciences 101 Dr. Mark Sanders MIDTERM I SAMPLE EXAM To assist your preparation for the first midterm exam in BIS 101, I have prepared this sample exam containing representative questions from past first midterm exams. This sample will give you an idea of the question style I prepare and will illustrate the depth of knowledge you must possess to fully answer questions. This sample exam is not intended to be a study guide and questions on topics that do not appear on the sample will be part of the midterm exam in your course. These questions will be a good source of practice, however, as the length of the exam and question difficulty is similar to what you will see in your exam. Answers to the exam questions are provided in a second document and I advise you to answer the question fully before looking at the answers.
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1. Ali, an avid gardener, decides to try her hand at iris propagation. She selects two pure breeding irises, one red and the other blue, and crosses them. To her surprise, all F 1 plants have purple flowers. She decides to create more purple irises by self-fertilizing the F 1 irises. Ali produces 168 F 2 plants consisting of 94 purple, 31 blue, and 43 red. a. From the information available, describe the genetic phenomenon that produces the phenotypic ratio observed in the F 2 plants. Identify the number of genes that are involved in this trait? Explain your reasoning. (4 pts) b. Using clearly defined symbols of your own choosing, identify the genotypes of parental and F 1 plants. (3 pts) c. Use chi-square analysis to test how closely the observed F 2 data matches the phenotype distribution expected under the genetic hypothesis explaining the data. On the answer lines below enter the expected number of plants in each phenotype class, the number of degrees of freedom, the chi-square value, and the approximate p value. In addition, clearly state whether you reject or fail to reject the genetic hypothesis and explain your reasoning. Show your work in the space below the answer lines. The chi-square formula and table are on the front page of the exam. (8 pts) Expected number of red =_________ purple = ___________ blue = ____________ df = ________ chi-square value = ____________ p value = _______________
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2. The following questions concern a dihybrid male fruit fly with the genotype DdEe . Remember that recombination does not occur in fruit fly males.
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Sample+MT+I+questions (1) - Biological Sciences 101 Dr....

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