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 20.1, Problem 3R
Summary Introduction
To review:
The ways, in which selections are done by humans in the agricultural crop, are different from natural selection. Also, give an example of a trait, which might get favored by artificial selection in agriculture but not by natural selection in a wild population.
Introduction:
Gene evolution constantly occurs in natural populations by an evolutionary process known as natural selection. The traits, which provide an evolutionary benefit to an organism, get selected and are passed on to the future generations. When this selection process is modified by human beings to select certain traits, such as in the case of agricultural crops, it is known as artificial selection or selective breeding.
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Life: The Science of Biology
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- If a person scatters a handful of plant seeds from one species in an area, how would natural selection work in this situation?arrow_forwardWhat is artificial selection? Provide an example.arrow_forwardIn a large population, dairy cows were selected for high milk production. What do you expect to happen with the genes affecting milk production? Do you expect to see a higher or lower variability of alleles after several years of selection?arrow_forward
- How are Belyaev and Trut’s breeding practices similar to, and how do they differ from,the way natural selection normally occurs?arrow_forwardWhat is the intuitive meaning of the mean fitness of a population? How does its value change in response to natural selection?arrow_forwardWhich of the following is an example of stabilizing selection?a. Over time, Equus developed strength, intelligence, speed,and durable grinding teeth.b. British land snails mainly have two different phenotypes.c. Swiss starlings usually lay four or five eggs, therebyincreasing their chances of more offspring.d. Drug resistance increases with each generation; theresistant bacteria survive, and the nonresistant bacteriaget killed off.e. All of these are correctarrow_forward
- Why does stabilizing selection decrease geneticdiversity?arrow_forwardWhat type of selection reduces genetic variation in a trait? disruptive? balancing? directional? stabilizing? Explain whyarrow_forwardWith respect to this form of natural selection, explain the meaning of the word directional.arrow_forward
- In order for a trait to evolve via natural selection, which of the following must be true regarding the trait? (this is a multiple answer question - so select all correct) Group of answer choices There must be variation in the trait. The trait must make the organism survive longer than organisms with different traits. The trait must confer a reproductive advantage on the bearer of the trait. The trait must be heritable. The trait does not necessarily need to be passed down to offspring.arrow_forwardIs Evolution Occurring in a Soybean Population?arrow_forwardIn many cases, one type of organism puts selection on another, so they evolve together. For example, flowers and the pollinators. This is called artificial selection Above statement True or False? give explanationarrow_forward
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