Campbell Biology (Custom) (Looseleaf)
10th Edition
ISBN: 9781269755887
Author: Reece
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 23.3CR
Would two small, geographically isolated populations in very different environments be likely to evolve in similar ways? Explain.
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According 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.
Why is it appropriate to define evolution as the change in allele frequencies of a population over time?
PINE TREE NEEDLES
Variation among members of a population can lead to natural selection, but only if two conditions are met: First, the trait must be relevant to an individual's survival and/or reproductive rate. Second, variation in this trait must be heritable, that is, at least partly controlled by genes. a. How might you design an experiment to determine the importance of needle length in determining survival and reproduction? b. How might you test the extent to which needle length is heritable?
Chapter 23 Solutions
Campbell Biology (Custom) (Looseleaf)
Ch. 23.1 - Explain why genetic Variation within a population...Ch. 23.1 - Ot all the mutations that occur in a population,...Ch. 23.1 - MAKE CONNECTIONS If a population stopped...Ch. 23.2 - A population has 700 individuals, 85 of genotype...Ch. 23.2 - The frequency of allele a is 0.45 for a population...Ch. 23.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 23.3 - In what sense is natural selection more...Ch. 23.3 - Distinguish genetic draft from gene flow in terms...Ch. 23.3 - WH AT IF? Suppose two plant populations exchange...Ch. 23.4 - What is the relative fitness of a sterile mule?...
Ch. 23.4 - Explain why natural selection is the only...Ch. 23.4 - Prob. 3CCCh. 23 - Typically. most of the nucleotide variabillity...Ch. 23 - Is it circular reasoning to calculate p ond q from...Ch. 23 - Would two small, geographically isolated...Ch. 23 - How might secondary sex characteristics in males...Ch. 23 - Natural selection changes allele frequencies...Ch. 23 - Prob. 2TYUCh. 23 - Prob. 3TYUCh. 23 - There are 25 individuals in population 1, all with...Ch. 23 - Prob. 5TYUCh. 23 - EVOLUTION CONNECTION Using at least two examples,...Ch. 23 - Prob. 7TYUCh. 23 - Prob. 8TYUCh. 23 - SYNTHESI2E YOUR KNOWLEDGE This kettle lake forracd...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The groups we recognize as different human races represented populations that have been genetically isolated for a long time, we would expect to see: Select all that apply and briefly justify your answer. a) high levels of genetic variation between groups relative to what we see within groups. b) high levels of genetic variation within groups relative to what we see between groups. c) no clear pattern of genetic variation―in some regions, we would see more variation within than among groups, and in some regions we would see the opposite. d) a correlation between the amount of genetic variation between groups and the length of time the groups have been isolated from one another.arrow_forwardTry to outline a scenario explaining the evolution of the three species shown in panel g. Use migration, mutation, genetic drift, selection, reproductive isolation, gene flow, extinction, and many generations in your scenario. Based on your scenario, what are the components that are necessary in a population in order for it to split or diverge into two new daughter species from a single ancestor (the parent species)?arrow_forwardSuppose that a population is at equilibrium between mutation and selection for a deleterious recessive allele, where s = 0.5 and μ = 10−5. What is the equilibrium frequency of the allele? What is the selection cost?arrow_forward
- In the Grants’ study of the medium ground finch, do you think the pattern of natural selection was directional, stabilizing, disruptive, or balancing? Explain your answer. If the environment remained dry indefinitely (for many years), what do you think would be the long-term outcome?arrow_forwardThe evolution of a qualitative trait in reponse to natural selection is described by the following equation, R=h2 S a) What is h2 and what does it measure? b) Describe a study that would allow you to estimate h2 for a real populationarrow_forwardYou conduct an exercise in the Darwinian Snails Sim-U-Text lab. You simulate conditions under which survival of snails is selective-that is, snails with thicker shells are less likely to be preyed on by crabs than snails with thinner shells. The default settings also ensure the trait is heritable, and the population has variation in this trait. You allow mutations to occur. As you run the simulation, you observe that the mean shell thickness of the population increases over successive snail generations. Have you successfully simulated natural selection? No, because no snails appeared with thicker shells than the thickest shells observed in the initial population O Yes, because crabs preyed on the snails O No, because you cannot have selection with mutations operating No, because the changes in shell thickness could have been due to genetic drift O Yes, because there was a change in the mean shell thickness Yes, because there were mutationsarrow_forward
- A population consist of 7 mice. For the coat trait, there are only two alleles: brown B and white (b). BB and Bb mice are brown; bb mice are white. In the population's gene pool, there are 7 white alleles(b). a) what is the frequency of the brown allel in the population? b) what do you predict the frequency of the bb genotype will be in the next generation if no evolution takes place in the population?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_forwardApply the VIDA table to the evolution of sickle cell disease to justify whether it is an instance of evolution by natural selection. Answer the following questions. Is there variation in this trait in the population? How exactly does it vary? Is the trait at least partly inherited? Is there selection for this trait in a particular environment? (What is the selective pressure? And how does a trait give an advantage or disadvantage in that environment?) What is the evidence that this trait makes organisms better adapted to their environment?arrow_forward
- Imagine a remote island inhabited by a population of lizards. To determine if this population is in Hardy-Weinberg equilibrium for gene X, which of the following conditions must be met? The lizard population should be at least 100 individuals and close to other large populations to avoid genetic drift. No selection, meaning that all individuals have an equal chance of survival and reproduction No gene flow due to migration between the island and other lizard populations Random mating among lizards without any preference to gene X No measurably significant mutations occurring in the lizard population at gene Xarrow_forwardWhat role does geographic isolation play in the formation of a new species? Group of answer choices A.If two populations become isolated geographically, then the two populations cannot interbreed with one another. There will be gene flow between the two. This will allow the two isolated populations to evolve independently leading to new species. B. If two populations become isolated geographically, then the two populations can interbreed with one another. There will be no gene flow between the two. This will allow the two isolated populations to evolve independently leading to new species. C. None of the answers are correct D. If two populations become isolated geographically, then the two populations cannot interbreed with one another. There will be no gene flow between the two. This will allow the two isolated populations to evolve independently leading to new species.arrow_forwardSuppose you have four species of lizard and you are interested in how leg length will change in a single generation of evolution under directional selection. Given the following parameters, which lizard do you predict will change the most in one generation? Species A: Heritability: 0.5, selection differential: 1.2 Species B: Heritability: 0.4, selection differential: -1.9 Species C: Heritability: 0.9, selection differential: -0.67 Species D: Heritability: 0.1, selection differential 3.2 Species A Species B Species C Species Darrow_forward
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