Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Chapter 20.1, Problem 2CC

Which of the trees shown here depicts an evolutionary history different from the other two? Explain.

Chapter 20.1, Problem 2CC, Which of the trees shown here depicts an evolutionary history different from the other two? Explain.

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Fruit scientists are trying to determine the role of the pectinase (p) gene in a plant’s ability to tolerate cold conditions. The table shows each of three possible fruit tree genotypes and the percentage of fruit produced at different temperature ranges.     Which of the following statements best describes the evolutionary concept illustrated by this example? A. Homozygous genotypes increase fitness in a population. B. Hybrid plants are known to have a disadvantage over homozygous genotypes. C. Natural selection selects against the recessive gene and for the dominant gene. D. Certain phenotypic variations can significantly increase fitness of the organism in particular environments.
The data presented in Part D shows the results of artificial selection for hairy Wisconsin Fast Plants. Identify the null hypothesis for this investigation?   A. If the mean number of trichomes is greater in the second generation than in the parent population, then selection has occurred. B. There will be no difference between the mean number of trichomes in the second generation compared to the parent population. C. As a result of selection, the mean number of trichomes will be greater in the second generation. D. If plants with the most trichomes in the first generation are selected as parents, then the second generation will have more trichomes.
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