Bio Exam 3 - 1. 2. 3. 4. 5. 6. Bio Exam 3 Which statement...

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Bio Exam 3 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 law 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 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 flowers. Which of the following best explains the result? a. The phenotype of the parent with purple flowers is affected by the environment b. White flower color is the wild type phenotype c. The parent with the purple flowers is homozygous for flower color d. A test cross is needed to explain the result e. The parent with purple flowers is heterozygous for this trait 6. In general, the frequency of crossing over between two linked genes depends on a. Whether the genes are dominant of co-dominant b. The phase of meiosis in which crossing over occurs c. Whether the genes are on the X or Y chromosome d. How far apart they are on the chromosome e. Employing a homozygous recessive parent in the cross
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7. In a particular species of mammal, black hair (B) is dominant to green hair (b) and red eyes (R) is dominant to white eyes (r). when a BbRr individual is mated with a bbrr individual, offspring are produced in the following rations: 5 black hair and red eyes: 5 green hair and white eyes: 1 black hair and white eyes: 1 green hair and red eyes. Which of the following best explains these ratios? a.
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This note was uploaded on 11/17/2011 for the course BIO 12334343 taught by Professor Jony during the Fall '09 term at Arizona.

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Bio Exam 3 - 1. 2. 3. 4. 5. 6. Bio Exam 3 Which statement...

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