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Unformatted text preview: Biology 181R Sections 5, 6H Brian Larkins and Ramin Yadegari Hour Exam #3 November 6, 2009 (Version 1 Key) LAST NAME: _____________________ FIRST NAME:__________________________ UA NET ID: ___________________ Instructions: Before starting this exam, read the Instructions! Fill in your name and NetID on both the exam booklet and the bubble sheet. Circle your answer on the exam copy AND use a #2 pencil to mark the corresponding answer on the bubble sheet. If you must change an answer, be certain that your first choice is erased completely. The bubble sheet is your “official” answer sheet! Read each question carefully and choose THE BEST answer. If you are unclear regarding what the question is asking, raise your hand and ask for clarification. When you have finished the exam, turn in both the bubble sheet and the exam book to the instructor at the front of the room. There are multiple versions of this exam. DO NOT LET YOUR EYES WANDER FROM YOUR EXAM! If you violate the code of academic integrity, you will be subject to sanctions such as loss of credit for this exam and possibly being assigned a failing grade for the course. 1. Which statement about an individual that is homozygous for an allele is NOT true? a. Each of its cells possesses two copies of that allele. b. Each of its gametes contains one copy of that allele. c. It is true-breeding with respect to that allele. *d. Its parents had to be homozygous for that allele. e. It can pass that allele to its offspring. 2. Mendel’s laws describing the segregation of traits for a given character and the independent assortment of the traits for different characters is explained by _________________________. a. the epistatic interaction of genetic loci b. the difference in genetic penetrance of alleles for different characters *c. the behavior of homologous chromosomes during the first meiotic division d. the separation of chromatids during the second meiotic division e. recombination between the chromatids of homologous chromosomes 3. In pea plants, the allele for purple flower color is dominant and that for white flower color is recessive. What ratio of offspring phenotypes would you expect from a cross between two plants with purple flowers if each of them had a parent that had white flowers? *a. 3 purple:1 white b. 1 purple: 3 white c. 1 purple: 1 white d. All the offspring would have purple flowers. e. All the offspring would have white flowers. 1 4. During meiosis 1, the random organization of homologous chromosome pairs at the metaphase plate leads to new combinations of maternal and paternal chromosomes. This explains __________________________. a. Mendel’s law of allele segregation b. the blending theory of inheritance *c. Mendel’s law of independent assortment of alleles d. the presence of true breeding plants e. None of these is correct 5. Pea plants that produce dominant purple flowers were crossed with plants that produce recessive white flowers. As a consequence, exactly one-half of the progeny had white...
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