Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134256283
Author: Audesirk
Publisher: PEARSON
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Chapter 15, Problem 1RQ
Natural selection acts on individuals, but only populations evolve. Explain why this statement is true.
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Natural selection is dependent on several factors, including the ability a population to survive and reproduce within a particular environment. How are both of these factors modeled?
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Genetic variation is the product of completely random events, but acting upon this randomness is a very nonrandom process called natural selection. Explain or give an example.
Chapter 15 Solutions
Biology: Life on Earth (11th Edition)
Ch. 15 - 1. Whale skeletons contain nonfunctional pelvic...Ch. 15 - 2. Darwin was influenced by Malthus's thinking...Ch. 15 - Prob. 3MCCh. 15 - Which of the following is NOT required for...Ch. 15 - 5. Which of the following is NOT evidence of...Ch. 15 - The flipper of a seal is homologous with the...Ch. 15 - The finding that all organisms share the same...Ch. 15 - Georges Cuvier espoused a concept called _______...Ch. 15 - 4. The process by which inherited characteristics...Ch. 15 - The process by which individuals with traits that...
Ch. 15 - Darwin's postulate 2 states that __________. The...Ch. 15 - Natural selection acts on individuals, but only...Ch. 15 - 2. Distinguish between catastrophism and...Ch. 15 - 3. Describe Lamarck’s theory of inheritance of...Ch. 15 - 4. What is natural selection? Describe how natural...Ch. 15 - 5. Describe how evolution occurs. In your...Ch. 15 - What is convergent evolution? Give an example.Ch. 15 - How do biochemistry and molecular genetics...Ch. 15 - Prob. 8RQCh. 15 - 1. In discussions of untapped human potential, it...Ch. 15 - 2. Does evolution through natural selection...
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- During drought years on the Galapagos, small, easily eaten seeds become rare leaving only large, hard-cased seeds that only birds with large beaks can eat. If the drought persists for several years, then what should one expect to result from natural selection? Explain your reasoning based on the postulates of the Darvin natural selection theory.arrow_forwardNatural selection ultimately reduces variation within a population over time, yet the forces described in your answer to question #1 increase variation. How can evolution by natural selection even occur if any selective progress is eroded away by the generation of genetic variation? summarize how these two opposing forces work together such that evolution can (and does) occurarrow_forwardnatural selection, why is maintaining genetic variation in populations such an important part of species being able to live through environmental changes? Include an examplearrow_forward
- Natural selection makes an adaptive trait more common in a population. After many generations, will all individuals in the population have the same adaptive trait?arrow_forwardIn one sentence each, identify the similarities and the differences between artificial selection and natural selection.arrow_forwardWith respect to this form of natural selection, explain the meaning of the word directional.arrow_forward
- Natural selection acts on individual but only population evolve true or falsearrow_forwardDarwin proposed natural selection as a mechanism for evolution. How is it similar to artificial selection? How is it different?For natural selection to work, there must be genetic variation within a population as well as mutations? Why must there be both?arrow_forwardEvolution is a process of___ in a population through___ variation over___ Evolution involves___ and___.arrow_forward
- Lamarck suggested that organisms arise spontaneously and then become increasingly more complex. With a partner, discuss why this idea is not supported by the theory of natural selection.arrow_forwardHow can Darwin's finches explain natural selection and descent with modification? What is another example of natural selection and descent with modification? In both of your answers, you should describe the trait that was selected for/against and why this trait was an advantage/disadvantage. Plus, state how natural selection changed the population over time.arrow_forwardHow can a shift in the proportion of genes in a population could lead to the evolution of a new species? Explain why evolution happens to a whole population rather than to a single individual.arrow_forward
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