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Unformatted text preview: 1 Biology , 8e (Campbell) Chapter 14 Mendel and the Gene Idea Multiple Choice Questions 1) Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that A) peas show easily observed variations in a number of characters, such as pea shape and flower color. B) it is possible to control matings between different pea plants. C) it is possible to obtain large numbers of progeny from any given cross. D) peas have an unusually long generation time. E) many of the observable characters that vary in pea plants are controlled by single genes. Answer: D Topic: Concept 14.1 Skill: Knowledge/Comprehension 2) What is the difference between a monohybrid cross and a dihybrid cross? A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B) A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. C) A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid only one. D) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations. E) A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio. Answer: C Topic: Concept 14.1 Skill: Knowledge/Comprehension 3) A cross between homozygous purple flowered and homozygous white flowered pea plants results in offspring with purple flowers. This demonstrates A) the blending model of genetics. B) true breeding. C) dominance. D) a dihybrid cross. E) the mistakes made by Mendel. Answer: C Topic: Concept 14.1 Skill: Knowledge/Comprehension 2 4) The F 1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because A) one phenotype was completely dominant over another. B) each allele affected phenotypic expression. C) the traits blended together during fertilization. D) no genes interacted to produce the parental phenotype. E) different genes interacted to produce the parental phenotype. Answer: A Topic: Concept 14.1 Skill: Knowledge/Comprehension 5) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units, and are not the results of "blending." C) Recessive genes occur more frequently in the F 1 than do dominant ones. D) Genes are composed of DNA. E) An organism that is homozygous for many recessive traits is at a disadvantage. Answer: B Topic: Concept 14.1 Skill: Knowledge/Comprehension 6) How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE ?...
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