Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 27, Problem 19CONQ
Describe what happens to allele frequencies as a result of the bottleneck effect. Discuss the relevance of this effect with regard to species that are approaching extinction.
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Explain how mutation, genetic drift, and gene flow can all contribute to changes in allele frequencies.
Describe a situation in which a population would undergo the bottleneck effect and explain what impact that would have on the population’s gene pool.
Give one example of how allele frequencies change from one generation to the next due to mutation, migration, genetic drift, nonrandom mating, and selection.
Chapter 27 Solutions
Genetics: Analysis and Principles
Ch. 27.1 - A gene pool is a. all of the genes in a single...Ch. 27.1 - 2. In natural populations, most genes...Ch. 27.1 - A gene exists in two alleles designatedDandd. If...Ch. 27.1 - Prob. 4COMQCh. 27.2 - Which of the following is a factor that, by...Ch. 27.3 - 1. Darwinian fitness is a measure...Ch. 27.3 - 2. Within a particular population, darkly colored...Ch. 27.3 - 3. A population occupies heterogeneous...Ch. 27.3 - Prob. 4COMQCh. 27.4 - 1. Genetic drift is
a. a change in allele...
Ch. 27.4 - 2. Which of the following influences on genetic...Ch. 27.5 - Gene flow depends on a. migration. b. the ability...Ch. 27.6 - 1. Inbreeding is sexual reproduction between...Ch. 27.7 - The mutation rate is a. the likelihood that a new...Ch. 27.7 - 2. The transfer of an antibiotic resistance gene...Ch. 27.7 - Prob. 3COMQCh. 27 - 1. What is the gene pool? How is a gene pool...Ch. 27 - Prob. 2CONQCh. 27 - Prob. 3CONQCh. 27 - Prob. 4CONQCh. 27 - The termpolymorphismcan refer to both genes and...Ch. 27 - Prob. 6CONQCh. 27 - For a gene existing in two alleles, what are the...Ch. 27 - 8. In a population, the frequencies of two...Ch. 27 - The ability to roll your tongue is inherited as a...Ch. 27 - What evolutionary factors can cause allele...Ch. 27 - What is the difference between a neutral and an...Ch. 27 - Prob. 12CONQCh. 27 - Prob. 13CONQCh. 27 - Describe the similarities and differences among...Ch. 27 - 15. Is each of the following examples due to...Ch. 27 - Prob. 16CONQCh. 27 - Prob. 17CONQCh. 27 - 18. A group of four birds flies to a new location...Ch. 27 - 19. Describe what happens to allele frequencies as...Ch. 27 - With regard to genetic drift, are the following...Ch. 27 - When two populations frequently intermix due to...Ch. 27 - Two populations of antelope are separated by a...Ch. 27 - Prob. 23CONQCh. 27 - 24. Using the pedigree shown here, answer the...Ch. 27 - A family pedigree is shown here. A. What is the...Ch. 27 - 26. A family pedigree is shown here.
A. What is...Ch. 27 - Prob. 27CONQCh. 27 - Prob. 28CONQCh. 27 - 1. You will need to be familiar with the...Ch. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 3EQCh. 27 - Prob. 4EQCh. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 6EQCh. 27 - Prob. 7EQCh. 27 - In the Grants study of the medium ground finch, do...Ch. 27 - 9. A recessive lethal allele has achieved a...Ch. 27 - Among a large population of 2 million gray...Ch. 27 - In a donor population, the allele frequencies for...Ch. 27 - Prob. 12EQCh. 27 - Prob. 13EQCh. 27 - Prob. 14EQCh. 27 - 15. What would you expect to be the minimum...Ch. 27 - Discuss examples of positive and negative...Ch. 27 - Discuss the role of mutation in the origin of...Ch. 27 - Prob. 3QSDC
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- Describe the impact of founder effects and population bottlenecks on the genetic diversity of human populations. Provide examples of populations that have experienced these events and discuss their implications for the genetic makeup of contemporary human groups.arrow_forwardWhen two populations frequently intermix due to migration, what are the long-term consequences with regard to allele frequencies and genetic variation?arrow_forwardFounder effects are most prominent in geographically, culturally or religiously isolated populations that undergo rapid expansion from a limited number of ancestors, when, as a consequence of low genetic diversity, some alleles become more frequent. True Falsearrow_forward
- Based on the figures, what is the effect of complete selection and migration on the gene and genotypic frequencies of the population? Describe the trend for each scenario and provide a brief explanation. 1. complete selection against recessive individuals 2. migrationarrow_forwardThe continued presence of the allele that causes sickle cell anemia in areas where falciparum malaria is prevalent demonstrates which of the following phenomena? (a) inbreeding depression (b) frequency-dependent selection (c) heterozygote advantage (d) genetic drift (e) a genetic bottleneckarrow_forwardHow Can We Measure Allele Frequencies in Populations? Explain the connection between changes in population allele frequencies and evolution, and relate this to the observations made by Wallace and Darwin concerning natural selection.arrow_forward
- Should you simulate gene flow (that is, the introduction of “outside” cats and their alleles into your “base” cat population)? If so, what would be a reasonable migration rate? What would be the frequency of the PKD allele in that “outside”/migrant population?arrow_forwardWhat affect will inbreeding tend to have on genotypic frequencies in a population? a) It will increase the frequency of genotypes that produce a dominant phenotype. b) It will decrease the frequency of genotypes that produce a dominant phenotype. c) It will increase the frequency of homozygous genotypes. d) It will increase the frequency of heterozygous genotypes.arrow_forwardwhat would happen to the gene frequencies during this following scenarios? a. complete selection b. migration c. random genetic drift.arrow_forward
- How can gene flow impact a population's allele frequencies? Choose one of the following: By causing mutations in the DNA By introducing new alleles through migration By wiping out a large proportion of the populationarrow_forwardWhat is a cline? A. A gradual change in genetic or phenotypic characteristics of a population within a set geographic space. B. A gradual change in genetic or phenotypic characteristics of a population over geographic space. C. Similar genetic or phenotypic characteristics of a population within the same geographic space. D. Discrete changes in genetic or phenotypic characteristics of a population over geographic space.arrow_forwardA situation in which hybrids are less successful (lower fitness) than individuals from either parent population will lead to which type of situation?arrow_forward
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