Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 20, Problem 1ITD

For centuries, animal breeders have used artificial selection to increase the speed of racehorses. The results of such efforts are illustrated in a graph that identifies how quickly winning horses ran the 1¼-mile track at the Kentucky Derby, a famous race held annually at Churchill Downs, Kentucky. (The time it takes a horse to run a track of fixed length is inversely proportional to the horse’s speed.) Based on the data in the graph, has artificial selection increased the speed of horses consistently between 1900 and 2000? Do you think that artificial selection can increase the speed of racehorses in the future?

Chapter 20, Problem 1ITD, For centuries, animal breeders have used artificial selection to increase the speed of racehorses.

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You work for the science division of an agribusiness that is trying to stay ahead of upcoming food trends. The company predicts that duck eggs are likely to become a popular fad soon, and you've been tasked with determining the feasibility of harnessing the power of natural selection to breed ducks to produce more consistently sized eggs. You go through the recent records for the company poultry farm to examine egg size for ducks and their female offspring. The mean egg size is 120 grams, with a variance of 480 grams2. You plot out the results with the mothers' average egg size on the x-axis and average daughters' egg size on the y-axis, and you calculate the slope of your linear regression between the two as 0.28.What is the narrow-sense heritability for egg size in this population?
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Which of the following traits would you expect to be under weakest selection? Explain your answer. The development of prostate cancer in older male humans The development of digits in frogs The silver hair color on silver back male gorillas The dance choreography in peacock spiders
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