Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 26, Problem 2PDQ
CONCEPT QUESTION Read the Chapter Concepts list on page 621. All these pertain to the principles of population genetics and the evolution of species. Write a short essay describing the roles of mutation, migration, and selection in bringing about
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n class we investigated the reason cystic fibrosis is maintained in the human population in higher frequency than we expected given the deleterious effects of being homozygous at the CFTR gene. We calculated the actual mutation rate of the CFTR gene to be 6.7 x 10-7. The mutation rate expected under mutation-selection balance was 4 x 10-4. What is the most plausible explanation as to why cystic fibrosis is maintained in the human population at a higher frequency than we expect?
a.
Negative selection against the CFTR deleterious alleles is too weak to eliminate the alleles from the human population.
b.
Positive selection for the CFTR deleterious alleles is likely occurring in response to some other selective pressure in the human population, possibly resistance to typhoid fever.
c.
The CFTR gene has an exceedingly low mutation rate causing humans to have no genetic variation at that gene.
d.
The CFTR gene has an exceedingly high mutation rate and that is…
In sexually reproducing species, each individual begins life with DNA inherited from both parent organisms. , Apply this idea to what occurs when organisms of two species that have homologous chromosomes mate and produce ( F1 ) hybrid offspring. What percentage of the DNA in the F1 hybrids' chromosomes comes from each parent species? As the hybrids mate and produce F2 and later-generation hybrid offspring, describe how recombination and natural selection may affect whether the DNA in hybrid chromosomes is derived from one parent species or the other.
Figure is attached
Please consider sexual selection operating on red-collared widowbirds assess the lowercase-Roman-numeral-labelled statements that appear immediately below; and click the uppercase-letter-labelled response that is presented below and conveys the most accurate information.
i. The specimen depicted at the top in the figure represents the group in which individuals were manipulated experimentally, trimmed so that tail lengths were shortened substantially.ii. The specimen depicted at the bottom in the figure represents the group in which individuals were unmanipulated, left untrimmed.iii. Individuals in the group represented by the specimen at the bottom fared better in condition (measured as body mass relative to length) terms than did individuals in the group represented by the specimen at the top.
iv. Individuals in the group represented by the specimen at the bottom spent more time flying and displaying to potential mates than did individuals in the group represented…
Chapter 26 Solutions
Concepts of Genetics (12th Edition)
Ch. 26 - The ability to taste the compound...Ch. 26 - Determine whether the following two sets of data...Ch. 26 - If the albino phenotype occurs in 1/10,000...Ch. 26 - A prospective groom, who is unaffected, has a...Ch. 26 - In a region of Quebec, Canada, 1 in 22 people are...Ch. 26 - Critics argue that a uniform panel of disorders...Ch. 26 - Others argue that the current testing system...Ch. 26 - HOW DO WE KNOW? Population geneticists study...Ch. 26 - CONCEPT QUESTION Read the Chapter Concepts list on...Ch. 26 - Price et al. [(1999).J. Bacteriol181:2358-2362)...
Ch. 26 - The genetic difference between two Drosophila...Ch. 26 - The use of nucleotide sequence data to measure...Ch. 26 - Prob. 6PDQCh. 26 - What must be assumed in order to validate the...Ch. 26 - In a population where only the total number of...Ch. 26 - If 4 percent of a population in equilibrium...Ch. 26 - Consider a population in which the frequency of...Ch. 26 - If the initial allele frequencies are p = 0.5 and...Ch. 26 - Under what circumstances might a lethal dominant...Ch. 26 - Assume that a recessive autosomal disorder occurs...Ch. 26 - One of the first Mendelian traits identified in...Ch. 26 - Describe how populations with substantial genetic...Ch. 26 - Achondroplasia is a dominant trait that causes a...Ch. 26 - Prob. 17PDQCh. 26 - Prob. 18PDQCh. 26 - A botanist studying water lilies in an isolated...Ch. 26 - A farmer plants transgenic Bt corn that is...Ch. 26 - In an isolated population of 50 desert bighorn...Ch. 26 - To increase genetic diversity in the bighorn sheep...Ch. 26 - What genetic changes take place during speciation?Ch. 26 - Some critics have warned that the use of gene...Ch. 26 - Prob. 25PDQCh. 26 - What are the two groups of reproductive isolating...Ch. 26 - A form of dwarfism known as Ellisvan Creveld...Ch. 26 - The original source of new alleles, upon which...Ch. 26 - A number of comparisons of nucleotide sequences...Ch. 26 - Shown below are two homologous lengths of the...Ch. 26 - Recent reconstructions of evolutionary history are...
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