Genetics: Analysis and Principles
5th Edition
ISBN: 9780073525341
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 27, Problem 21CONQ
When artificial selection is practiced over many generations, it is common for the trait to reach a plateau in which further selection has little effect on the outcome of the trait. This phenomenon is illustrated in Figure 28.11. Explain why it occurs.
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Chapter 27 Solutions
Genetics: Analysis and Principles
Ch. 27.1 - 1. Which of the following is an example of a...Ch. 27.1 - 2. Saying that a quantitative trait follows a...Ch. 27.2 - The variance is a. a measure of the variation...Ch. 27.2 - 2. Which of the following statistics is used to...Ch. 27.3 - 1. For many quantitative traits, genotypes and...Ch. 27.3 - A QTL is a __________ where one or more genes...Ch. 27.3 - 2. To map QTLs, strains are crossed that differ...Ch. 27.4 - 1. In a population of squirrels in North Carolina,...Ch. 27.4 - Prob. 2COMQCh. 27.4 - 3. One way to estimate narrow-sense heritability...
Ch. 27.5 - 1. For selective breeding to be successful, the...Ch. 27.5 - Prob. 2COMQCh. 27 - Give several examples of quantitative traits.How...Ch. 27 - 2. At the molecular level, explain why...Ch. 27 - 3. What is a normal distribution? Discuss this...Ch. 27 - 4. Explain the difference between a continuous...Ch. 27 - What is a frequency distribution? Explain how such...Ch. 27 - 6. The variance for weight in a particular herd of...Ch. 27 - Two different varieties of potato plants produce...Ch. 27 - 8. If , would you conclude that a positive...Ch. 27 - Prob. 9CONQCh. 27 - When a correlation coefficient is statistically...Ch. 27 - 11. What is polygenic inheritance? Discuss the...Ch. 27 - What is a quantitative trait locus (QTL)? Does a...Ch. 27 - 13. Let’s suppose that weight in a species of...Ch. 27 - Prob. 14CONQCh. 27 - 15. From an agricultural point of view, discuss...Ch. 27 - Many beautiful varieties of roses have been...Ch. 27 - 17. In your own words, explain the meaning of the...Ch. 27 - 18. What is the difference between broad-sense...Ch. 27 - The heritability for egg weight in a group of...Ch. 27 - In a fairly large population of people living in a...Ch. 27 - When artificial selection is practiced over many...Ch. 27 - 22. Discuss whether a natural population of wolves...Ch. 27 - 23. With regard to heterosis, is each of...Ch. 27 - Here are data for height and weight among 10 male...Ch. 27 - 2. The abdomen length (in millimeters) was...Ch. 27 - 3. You conduct an RFLP analysis of head weight in...Ch. 27 - 5. Let’s suppose that two strains of pigs differ...Ch. 27 - Prob. 6EQCh. 27 - In a wild strain of tomato plants, the phenotypic...Ch. 27 - The average thorax length in aDrosophilapopulation...Ch. 27 - 9. In a strain of mice, the average 6-week body...Ch. 27 - Prob. 11EQCh. 27 - 11. A danger in computing heritability values from...Ch. 27 - For each of the following relationships,...Ch. 27 - An animal breeder had a herd of sheep with a mean...Ch. 27 - The trait of blood pressure in humans has a...Ch. 27 - Prob. 10EQCh. 27 - Discuss why heritability is an important...Ch. 27 - From a biological viewpoint, speculate as to why...Ch. 27 - 3. What is heterosis? Discuss whether it is caused...
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