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 among directional, balancing, disruptive, and stabilizing selection.
Describe the similarities and differences between the stabilizing, directional, and disruptive selection models.
Explain, draw, and provide example of directional, stabilizing and disruptive selection.
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Life: The Science of Biology
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- Compare and contrast directional selection and disruptive selection, and provide an example of each.arrow_forwardExplain 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_forward
- Compare and contrast direct and indirect selection.arrow_forwarddescribe selection, confounding, and information bias provide an example for eacharrow_forwardIn the following form of selection, one extreme of a variable character is selected for: Directional Selection Stabilizing Selection Disruptive Selectionarrow_forward
- (Fill in the blank) selection tends to keep a trait the same overtime while (fill in the blank) selection tends to lead to a change in a trait over time. Using the following words fill in the blank: natural, artificial, stabilizing, or directionalarrow_forwardMark each statement as True/ False while describing frequency dependent, frequency independent and sexual selection. In negative frequency selection, rare phenotypes are selected against In positive frequency selection, the more common phenotype is selected for The long mane of the male lion which is not present in females is an example of sexual dimorphism An example of the handicap principle can be seen in the similar body forms of male and female birds such as the mourning dove The antlers seen in male antelope, caribou, and mountain goats are example of sexual dimorphismarrow_forwardIntrasexual selection favors traits that enhance direct competition among individuals of the same sex. are attractive to the opposite sex. increase survival. are easily adapted to change.arrow_forward
- Sexual and Ecological selection often oppose each other: give 2 examplesarrow_forwardIn what ways has artificial selection changed people’s quality of life? Give examples. How might artificial selection be used to improve our quality of life further? Can you envision a way it could be used to reduce our environmental impact?arrow_forwardTypes of Selection Match each situation to the type of selection most likely to occur. NOTE: If you want to change your selection, you'll need to delete the one you already chose. After you delete it, the list of choices will pop back up and you can make a different choice. Rabbits with medium colored fur blend into the background, but very light or very dark fur colors are easier for predators to spot. disruptive selection Drab colored guppies are less likely to be eaten by predators, but brightly colored males are preferred by females. sexual selection Butterflies with small wings can easily find hiding places to escape predators. Butterflies with large wings can fly higher and faster to directional selection stabilizing selection escape predators. A species of rodent is vulnerable to cold weather when small, but able to keep warm when large.arrow_forward
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