CH12_Answers

CH12_Answers - Raven/Johnson Biology 8e 1. A true-breeding...

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Raven/Johnson Biology 8e Chapter 12 1. A true-breeding plant is one that— a. produces offspring that are different from the parent b. forms hybrid offspring through cross-pollination c. produces offspring that are always the same as the parent d. can only reproduce with itself The correct answer is c— A. Answer a is incorrect. A true breeding plant will produce offspring that are identical to the parent The correct answer is c— B. Answer b is incorrect. True breeding involves self-fertilization, not fertilization between two different plants. The correct answer is c—produces offspring that are always the same as the parent C. Answer c is correct. The offspring are genetically identical to the parent. The correct answer is c— D. Answer d is incorrect. True breeding only means that the offspring produced by self- fertilization are identical. These plants can be crossed with other true-breeding plants. 2. What property distinguished Mendel’s investigation from previous studies? a. Mendel used true-breeding pea plants. b. Mendel quantified his results. c. Mendel examined many different traits. d. Mendel examined the segregation of traits. The correct answer is b— A. Answer a is not correct. Other early researchers had used pea plants. The correct answer is b—Mendel quantified his results. B. Answer b is correct. The fact that Mendel determined the ratio of different phenotypic traits led to our current understanding of inheritance. The correct answer is b— C. Answer c is not correct. Other early researchers had examined a variety of traits. The correct answer is b— D. Answer d is not correct. The segregation of traits had been observed by others. 3. A monohybrid cross— a. is the same as self-fertilization b. examines a single variant of a trait c. produces a single offspring d. examines two variants of a single trait The correct answer is d— A. Answer a is not correct. Monohybrid crosses can be made between two individuals.
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Raven/Johnson Biology 8e Chapter 12 The correct answer is d— B. Answer b is not correct. A monohybrid cross examines two versions of a single trait. The correct answer is d— C. Answer c is not correct. The term monohybrid refers to the trait being examined, not the number of offspring. The correct answer is d—examines two variants of a single trait D. Answer d is correct. A monohybrid cross examines a single trait with two versions (e.g., purple versus white flowers). 4. What was the appearance of the F 1 generation of a monohybrid cross of purple ( PP ) and white ( pp ) flower pea plants? a. All the F 1 plants had white flowers. b. The F 1 plants had a light purple or blended appearance. c. All the F 1 plants had purple flowers. d.
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This note was uploaded on 06/07/2009 for the course BIO 5 taught by Professor Martins-green during the Spring '09 term at UC Riverside.

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CH12_Answers - Raven/Johnson Biology 8e 1. A true-breeding...

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