exam1-08key - name:_ student ID:_ Genetics L311 exam 1...

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name:_______________________ student ID:_____________________ Genetics L311 exam 1 September 26, 2008 Directions: Please read each question carefully . Answer questions as concisely as possible. Excessively long answers, particularly if they include any inaccuracies, may result in deduction of points. You may use the back of the pages as work sheets, but please write your answer in the space allotted and please show all your work. Clearly define your genetic symbols. We will not make guesses as to what a particular symbol is intended to mean. Also, don’t assume that strains are true- breeding unless this is stated in the question. Finally, show all your work. Good luck. page 2 _______ (20 points possible) page 3 _______ (23 points possible) page 4 _______ (18 points possible) page 5 _______ (25 points possible) page 6 (14 points possible) total _______ (of 100 points possible) 1
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name:_______________________ student ID:_____________________ 1. Short answers (2 points each, 20 points total) a. A(n) diploid cell has pairs of homologous chromosomes. b. Pleiotropy is when a mutation in a single gene affects many traits. c. Polar body is a "dead end" product of meiosis. It is used as a means of disposing of extra chromosomes during oogenesis. For this reason, it receives very little of the cytoplasm that was present in the mother cell. d. The physical manifestations of crossing over are called the chiasmata . e. Genotype refers to the genetic makeup of an individual, often in reference to one or a few genes. f. Individuals in which two different alleles of a gene are present are said to be heterozygous . g. The situation where a homozygous mutant individual does not show an expected trait is incomplete penetrance . For the following, please provide a brief definition of the term given: h. hemizygous: Having only one copy of a gene or chromosome segment. i. cytokinesis: Division of the cell that accompanies mitosis or meiosis.
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This note was uploaded on 07/01/2011 for the course L 311 taught by Professor Forrester during the Fall '10 term at Indiana State University .

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exam1-08key - name:_ student ID:_ Genetics L311 exam 1...

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