Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 20.4, Problem 1R
Summary Introduction
To review:
The outcomes of the stabilizing, directional, and disruptive selections.
Introduction:
The natural selection is the process by which the organism adapts to the existing environment in order to survive in a better way. The natural selection follows three types of selection patterns depending on the circumstances. These are stabilizing, directional, and disruptive.
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Describe the similarities and differences between the stabilizing, directional, and disruptive selection models.
Compare and contrast directional selection and disruptive selection, and provide an example of each.
Explain the difference between Disruptive Selection & Directional Selection ?
Chapter 20 Solutions
Life: The Science of Biology
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- Explain how negative frequency-dependent selection works.arrow_forwardDescribe the competing selective forces acting on peacock tails. Together, do these selective forces produce disruptive, directional, or stabilizing selection?arrow_forwardExplain the stabilizing selection effects on the phenotypic mean and the amount of phenotypic variation present in a population.arrow_forward
- Describe the similarities and differences among directional, balancing, disruptive, and stabilizing selection.arrow_forwardIs each of the following examples due to directional, disruptive, balancing, or stabilizing selection? A. Polymorphisms in snail color and banding pattern as described. B. Thick fur among mammals exposed to cold climates C. Birth weight in humans D. Sturdy stems and leaves among plants exposed to windy climatesarrow_forwardExplain the disruptive selection effects on the phenotypic mean and the amount of phenotypic variation present in a population.arrow_forward
- In the following form of selection, one extreme of a variable character is selected for: Directional Selection Stabilizing Selection Disruptive Selectionarrow_forwardanswers: Disruptive selection, Directional Selection, Stabilizing selection, Hardy-Weinburg selection. Which is correct for the stated question?arrow_forwardWhat are two reasons why a selection limit is reached in which artificial selection no longer has an effect?arrow_forward
- Population and Quantitative Genetics. Assume the mean value for Trait A in Generation 0 is 0.5. Mean value for those individuals that reproduce in Generation 0 is 0.75. Selection differential, S is 0.25. Predicted response to selection, R is 0.143. What is the predicted mean trait value in Generation 1?arrow_forwarddescribe selection, confounding, and information bias provide an example for eacharrow_forwardUnder which of the following scenarios would variation be maintained? Selection acting on a dominant high fitness allele Selection acting on a recessive high fitness allele Selection favoring heterozygotes Selection acting against heterozygotes None of the abovearrow_forward
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