Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
10th Edition
ISBN: 9780133922851
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 24, Problem 5TYU
Which of the following factors would not contribute to allopatric
- (A) The separated population is small, and genctic drift occurs.
- (B) The isolated population is exposed to different selection pressures than the ancestral population.
- (C) Different mutations begin to distinguish the gene pools of the separated populations.
- (D) Gene flow between the two populations is extensive.
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21)
ALL BUT ONE of the statements below helps to describe gene flow. That is
A)
B)
Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate.
There are three primary sources of genetic variation:
1. Mutations
II. Gene flow
III. Sexual reproduction
D)
It depends on a chance event that changes the gene pool.
It can reduce the genetic differentiation between the two groups.
It involves the movement of alleles from one population to another.
It includes migration or the movement of individuals between populations.
Some mutations always occur from generation to generation. But most mutations do not persist over time in the gene
pool. Which mutation is MOST likely to become established and persist in a species?
According to the punctuated equilibria model,(A) given enough time, most existing species will branchgradually into new species.(B) most new species accumulate their unique features relatively rapidly as they come into existence, then changelittle for the rest of their duration as a species.(C) most evolution occurs in sympatric populations.(D) speciation is usually due to a single mutation.
1. a) List the forces affecting the evolution of natural populations
b) all these factors in (a) influence the genetic variation in natural populations. Briefly explain how these factors influence or affect genetic variation.
Chapter 24 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Ch. 24.1 - Prob. 1CCCh. 24.1 - WHAT IF? Suppose two bird species live in a...Ch. 24.2 - Summarize key differences between allopatric and...Ch. 24.2 - Prob. 2CCCh. 24.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 24.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 24.3 - 1. What are hybrid zones, and why can they be...Ch. 24.3 - WHAT IF? Consider two species that diverged while...Ch. 24.4 - Speciation can occur rapidly between diverging...Ch. 24.4 - Prob. 2CC
Ch. 24.4 - Prob. 3CCCh. 24 - Explain the role of gene flow in the biological...Ch. 24 - Can factors that cause sympatric speciation also...Ch. 24 - What factors can support the long-term stability...Ch. 24 - Is speciation something that happened only in the...Ch. 24 - The largest unit within which gene flow can...Ch. 24 - Prob. 2TYUCh. 24 - Prob. 3TYUCh. 24 - Prob. 4TYUCh. 24 - Which of the following factors would not...Ch. 24 - Plant species A has a diploid chromosome number of...Ch. 24 - Prob. 7TYUCh. 24 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 24 - Prob. 9TYUCh. 24 - Prob. 10TYUCh. 24 - WRITE ABOUT A THEME: INFORMATION In sexually...Ch. 24 - Prob. 12TYU
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- compare and contrast between the following a) allopatric speciation and sympatric speciation. b) autopolyploid speciation and allopolyploid speciation c) natural selection and sexual selectionarrow_forward1) Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed.arrow_forward1) Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. Not gradedarrow_forward
- which statement is false? 1)In the context of the evolution of senescence, the aphorism "live fast and die young" means that organisms with a more risky behavior will have a shorter life span. 2)Allopatric speciation is a type of speciation process that takes place in different geographic locations.arrow_forwardExplain the type of speciation (allopatric, parapatric, or sympatric) most likely to occur under each of the following conditions: A. A pregnant female rat is transported by an ocean liner to a new continent. B. A meadow containing several species of grasses is exposed to a pesticide that promotes nondisjunction. C. In a very large lake containing several species of fish, the water level gradually falls over the course of several years. Eventually, the large lake becomes subdivided into smaller lakes, some of which are connected by narrow streams.arrow_forwardAnswer the following biology questions on evolutionarrow_forward
- Name two events that must happen for both allopatric speciation and sympatric speciation to occur.arrow_forwardDarwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. not graded use photoarrow_forwardWhich of the evolutionary processes discussed in the material presented can introduce genetic variation into a population? a) natural selection and genetic drift b) mutation and gene flow c) natural selection and nonrandom mating d) mutation and genetic driftarrow_forward
- 8) What data would suggest that a species evolutionary history includes sexual selection as a mechanism that helped shape the species? A) If males and females are significantly different from each other (sexual dimporphism) B) If some males reproduce with multiple females while other males do not reproduce C) If males engage in "risky" behavior D) If males and females form different social groups (i.e. herds are formed from either males or females but not both)arrow_forwardAccording to the Hardy-Weinberg law of equilibrium: Question 1 options: A) In absence of mutation and natural selection, the frequencies of the genotypes will remain stable because no evolutionary change takes place. B) In absence of gene flow, the frequencies of the genotypes will remain stable because no evolutionary change takes place. C) In absence of genetic drift, the frequencies of the genotypes will remain stable because no evolutionary change takes place. D) All of the above. E) None of the above.arrow_forwardTwo morphological variants in a population of medium ground finch on the Galapagos Islands have been found to exist. Individuals of each variant respond more strongly to songs produced by the same variant, and prefer to mate with individuals of their own morphological variant. What type of speciation could be in progress, and what measurements could inform the extent of prezygotic reproductive barriers that have developed? A. Sympatric speciation by sexual selection; survival and reproductive success of hybrids of the two morphological variants. B. Allopatric speciation by habitat differentiation; survival and reproductive success of hybrids of the two morphological variants. C. Sympatric speciation by sexual selection; frequencies of mating and numbers of viable offspring of the two morphological variants. D. Allopatric speciation by habitat differentiation; frequencies of mating and numbers of viable offspring of the two morphological variants.arrow_forward
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