ch03_review - Klug, Concepts of Genetics 8/e CHAPTER 3...

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Klug, Concepts of Genetics 8/e CHAPTER 3 MEDIA REVIEW QUESTIONS 1. Which of the following factors was not crucial to the success of Gregor Mendel's experiments? HINT: What methodology is necessary for good experimental biology? a. He kept detailed quantitative records. Incorrect. This factor was crucial; sometimes subtle differences between experimental groups are only revealed through statistical analysis. 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance (p. 40) b. He chose traits that were not greatly influenced by the environment. Incorrect. This factor was crucial; when the environmental component of a trait is large, it is hard to know whether genetic or environmental causes are responsible for an observed phenotype. 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance (p. 40) c. He always allowed all pea plants to self-fertilize, avoiding contamination from other individuals. Correct. This was not a factor; Mendel often crossed different individuals in his experiments. 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance (p. 40) d. He observed only one or two traits in any given experiment. Incorrect. This factor was crucial; by keeping his manipulations simple, Mendel could interpret his results more easily. 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance (p. 40) 2. True or false? A true-breeding plant is one that is homozygous for the trait under study. HINT: True-breeding plants always give rise to offspring whose phenotypes are just like the parents. True. True-breeding plants are homozygous for the trait under study, and their offspring always have phenotypes identical to those of the parents. 3.1 Mendel Used a Model Experimental Approach to Study Patterns of Inheritance (p. 40) 3. Which two genotypes in an individual would be expressed as the same phenotype in a diploid organism? HINT: How do genotypes correlate with phenotypes? a. Homozygous dominant and homozygous recessive Incorrect. The homozygous dominant individual (both alleles dominant) would express the dominant phenotype, and the homozygous recessive individual (both alleles recessive) would express the recessive phenotype. 3.2 The Monohybrid Cross Reveals How One Trait Is Transmitted from Generation to Generation (p. 40) b. Homozygous dominant and heterozygous
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Correct. Both of these genotypes would express the dominant phenotype. The homozygous dominant individual would have both copies of the dominant allele, and the heterozygous individual would have one copy of the dominant allele and one copy of the recessive allele, but only the dominant phenotype would be observed. 3.2 The Monohybrid Cross Reveals How One Trait Is Transmitted from Generation to Generation (p. 40) c. Homozygous recessive and heterozygous Incorrect. The homozygous recessive individual (both alleles recessive) would express the recessive phenotype, and the heterozygous individual would express the dominant phenotype. 3.2
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This test prep was uploaded on 04/06/2008 for the course BIOL 313 taught by Professor Vollbrecht during the Spring '08 term at Iowa State.

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ch03_review - Klug, Concepts of Genetics 8/e CHAPTER 3...

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