Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 23, Problem 7TY
Summary Introduction

Introduction: A series of experiments were performed by Ole Seehausen and Jacques Van Alphen in 1998 to investigate the complex nature of sexual selection in a population of fish. They performed experiments in a population that ranged from light shade of white to darker shades of green. When light-colored sandy and dark vegetation are included in the environment, both light and dark colored members were able to survive.

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When taking the question, it would appear as: Consider global warming, a continual gradual increase in average temperatures. How might you expect this to affect natural selection? A.environmental changes are unpredictable, and natural selection is a random process, so it is difficult to predict outcome B.species from warmer climates are likely to expand their ranges into higher latitudes C.traits that increase reproductive success under warmer temperatures are likely to increase in frequency in a population D.the stress caused by higher temperatures will increase mutation rates
What is the difference between artificial selection (e.g., greyhounds that are bred for speed) and natural selection?   a. In artificial selection, the genetic variation introduced into the population is limited, but in natural selection, it is not   b. In artificial selection, the environment is the selective force, while in natural selection, humans are the selective force   c. In natural selection, the environment is the selective force, while in artificial selection, humans are the selective force   d. Unlike other species, dogs are not subject to natural selection   e. Both A & C
Which evolutionary forces a. cause an increase in genetic variation both within and between populations? b. cause a decrease in genetic variation both within and between populations? c. cause an increase in genetic variation within populations but cause a decrease in genetic variation between populations?
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