Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
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?
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.
27) In the fruit fly speciation experiment, individuals from separate populations that were raised using the same food source were
more likely to attempt mating with each other than individuals raised on different food sources. Why?
A) Because they had adapted to their environment in the same way
B) Because this is an example of allopatric speciation
C) Because the separate populations were able to carry out some gene flow
D)Because the jars were accidently placed next to each other so the males and females were able to recognize each
28) What is needed for natural selection to occur?
A) Variation sexual reproduction, competition
B) Variation, heritability competition
C)Variation, competition, time
D) Heritability, competition, sexual reproduction
Chapter 24 Solutions
Campbell Biology
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 - MAKE CONNECTIONS Compare Figure 13.12 with Figure...Ch. 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 - WRITE ABOUT A THEME: INFORMATION In sexually...Ch. 24 - Prob. 10TYU
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- 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_forward14) Hybridization was not originally recognized as a mechanism of speciation by either Darwin or the researchers of the "new synthesis". However, today there are many examples of species that have originated through hybridization. What is the best explanation for why we have so many examples of species originating through hybridization? A) Hybridization is more likely to occur in regions where scientists have put in more effort studying speciation B) Hybridization occurs fairly regularly, and when it leads to new species only takes a few generations, which is fast enough for researchers to see fairly easily C) Hybridization is fairly easy to study in captivity D) Hybridization has been carried out frequently by farmers attempting to produce new, better species to grow 15) Anthropologist who study human evolution genetically have determined that populations of our species have gone through"founder effect" type events. What data would suggest that…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_forward
- Name two events that must happen for both allopatric speciation and sympatric speciation to occur.arrow_forwardThere are 25 individuals in population 1, all with genotype AA,and there are 40 individuals in population 2, all with genotypeaa. Assume that these populations are located far from eachother and that their environmental conditions are very similar.Based on the information given here, the observed geneticvariation most likely resulted from(A) genetic drift.(B) gene flow.(C) nonrandom mating.(D) directional selection.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_forward
- Which 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_forward1) What is the source of modifications that contribute to the variety of offspring produced by descent with modification (HINT: Think of concepts discussed in the genetics and reproduction units) 2) During Charles Darwin’s voyages, he observed species of plants and animals unique to specific islands, but with similar looking species on nearby islands. How did Darwin explain these similarities and differences? 3) Unique species of animals found on isolated islands are not randomly different from their mainland “cousins,” they are especially and uniquely adapted for island life. Provide examples of this phenomenon. How can this occurrence be explained?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_forward
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