Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
9th Edition
ISBN: 9780134047201
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 22, Problem 18PDQ
A recent study examining the mutation rates of 5669 mammalian genes (17,208 sequences) indicates that, contrary to popular belief, mutation rates among lineages with vastly different generation lengths and physiological attributes are remarkably constant (Kumar, S., and Subramanian, S. 2002. Proc. Natl. Acad. Sci. [USA] 99: 803–808). The average rate is estimated at 12.2
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James Noonan and his colleagues (J. Noonan et al. 2005. Science 309:597–599) set out to study the genome sequence of an extinct species of cave bear. They extracted DNA from 40,000-year-old bones from a cave bear and used a metagenomic approach to isolate, identify, and sequence the cave-bear DNA. Why did they use a metagenomic approach when their objective was to sequence the genome of one species (the cave bear)?
The use of nucleotide sequence data to measure genetic variability is complicated by the fact that the genes of higher eukaryotes are complex in organization and contain 5′ and 3′ flanking regions as well as introns. Researchers have compared the nucleotide sequence of two cloned alleles of the g-globin gene from a single individual and found a variation of 1 percent. Those differences include 13 substitutions of one nucleotide for another and 3 short DNA segments that have been inserted in one allele or deleted in the other. None of the changes takes place in the gene’s exons (coding regions). Why do you think this is so, and should it change our concept of genetic variation?
If you compare the frequency of the sixteen possible dinucleotide sequences in the E. coli and human genomes, there are no striking differences except for one dinucleotide, 5ʹ-CG-3ʹ. The frequency of CG dinucleotides in the human genome is significantly lower than in E. coli and significantly lower than expected by chance. Why do you suppose that CG dinucleotides are underrepresented in the human genome? (hint: The C in the CG pair is often methylated).
Explain how this observation has an impact on the cells immune response.
Chapter 22 Solutions
Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
Ch. 22 - CASE STUDY |An unexpected outcome A newborn...Ch. 22 - CASE STUDY |Anunexpected outcome A newborn...Ch. 22 - CASE STUDY|An unexpected outcome A newborn...Ch. 22 - HOW DO WE KNOW? Population geneticists study...Ch. 22 - Review the Chapter Concepts on page 441. All these...Ch. 22 -
3. Price et al. (1999. J. Bacteriol. 181:...Ch. 22 -
4. The genetic difference between two Drosophila...Ch. 22 - The use of nucleotide sequence data to measure...Ch. 22 - Calculate the frequencies of the AA, Aa, and aa...Ch. 22 - Prob. 7PDQ
Ch. 22 -
8. What must be assumed in order to validate the...Ch. 22 - In a population where only the total number of...Ch. 22 -
10. If 4 percent of a population in equilibrium...Ch. 22 -
11. Consider a population in which the frequency...Ch. 22 - If the initial allele frequencies are p = 0.5 and...Ch. 22 -
13. Under what circumstances might a lethal...Ch. 22 - Assume that a recessive autosomal disorder occurs...Ch. 22 -
15. One of the first Mendelian traits identified...Ch. 22 -
16. Describe how populations with substantial...Ch. 22 - Achondroplasia is a dominant trait that causes a...Ch. 22 -
18. A recent study examining the mutation rates...Ch. 22 - A form of dwarfism known as Ellis–van Creveld...Ch. 22 -
20. List the barriers that prevent interbreeding...Ch. 22 - What are the two groups of reproductive isolating...Ch. 22 - Prob. 22PDQCh. 22 -
23. In a recent study of cichlid fish inhabiting...Ch. 22 - What genetic changes take place during speciation?Ch. 22 - Some critics have warned that the use of gene...Ch. 22 - Comparisons of Neanderthal mitochondrial DNA with...
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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 Japanese canopy plant (Paris japonica) has one of the largest of all eukaryotic genomes, with approximately 150 billion base pairs, about 50 times the size of the human genome. In contrast, the bladderwort Utricularia gibba has one of the smallest plant genomes, with only 82 million base pairs. What predictions can you make about the genomes of these two species?arrow_forwardGiven our knowledge of genome sizes in different organisms, would you predict that Homo sapiens or the two-toed salamander (Amphiuma means) has the larger genome?arrow_forwardThe use of nucleotide sequence data to measure genetic variabilityis complicated by the fact that the genes of many eukaryotesare complex in organization and contain 5' and 3' flankingregions as well as introns. Researchers have compared thenucleotide sequence of two cloned alleles of the y-globin gene from asingle individual and found a variation of 1 percent. Those differencesinclude 13 substitutions of one nucleotide for anotherand three short DNA segments that have been inserted in oneallele or deleted in the other. None of the changes takes placein the gene’s exons (coding regions). Why do you think this isso, and should it change our concept of genetic variation?arrow_forward
- With the information that a Wright- Fisher population have a size of 10,000 and assume that mutation rate is 2.5x10-8 per site per generation. What is the probability of difference between the two sequences that were randomly taken from the population? Show all working and explanation.arrow_forwardRecently, scientists have identified a mutation that is found at high frequency in Finnish populations, located in northern Europe where the winter is very cold. This mutation is believed to be a “cold sensitive” allele that warns people of extreme cold temperatures. Could this allele have undergone a “selective sweep”, if it had suddenly appeared in this northern population of humans? How would such a selective sweep be detected with genome data?arrow_forwardWhen an Avidian (with a genome size of 50 sites) reproduces with a 10% per site mutation rate, and if the number of mutations per genome is Poisson distributed, then what is the most likely outcome? Possible answers: 4 per genome is most likely, 5 per genome is most likely, 4 mutations per genome and 5 mutations per genome are equally likely, A number other than 4 and/or 5 mutations per genome is most likelyarrow_forward
- Why was noncoding DNA previously called 'junk DNA' and why is the term no longer considered appropriate? How do comparisons of genomes of distantly related species (such as humans and mice) provide evidence for this?arrow_forwardFor each of the following examples, discuss whether the observed result is due to neutral mutations or mutations that have been acted on by natural selection, or both: A. When comparing sequences of homologous genes, differences in the coding sequence are most common at the wobble base (i.e., the third base in each codon). B. For a protein-encoding gene, the regions that encode portions of the polypeptide that are vital for structure and function are less likely to display mutations than other regions of the gene. C. When comparing the sequences of homologous genes, introns usually have more sequence differences than exons.arrow_forwardIf you compare the frequency of the sixteen pos-sible dinucleotide sequences in the E. coli and humangenomes, there are no striking differences except for onedinucleotide, 5ʹ-CG-3ʹ. The frequency of CG dinucleotidesin the human genome is significantly lower than in E. coliand significantly lower than expected by chance. Why doyou suppose that CG dinucleotides are underrepresentedin the human genome?arrow_forward
- What is the major difference in how duplicationshave contributed to the evolution of the genomes ofprokaryotic and eukaryotic cells?arrow_forwardWhat are two reasons for the wide variation in genome sizes among eukaryotic species?arrow_forward. In 2015, an international team of scientists assembledthe complete genome sequences of two differentwoolly mammoths. Both specimens were discoveredburied in the permafrost of Siberia, the coldest inhabited place on earth. Through radiocarbon dating, itwas determined that one of the mammoths, found onWrangel Island off the Siberian coast, died about4000 years ago; the other mammoth, found in thetown of Oimyakon, died about 45,000 years ago.Analysis revealed that the genome sequences ofthese two animals differed significantly in the distribution of base pairs at which they are either homozygous or heterozygous. The Wrangel Island woollymammoth had an extreme excess of runs of homozygosity (ROHs), regions in which the animal was homozygous for all of the base pairs. About 23.4% ofthe Wrangel Island animal’s genome was composed ofROHs that were greater than 500 kb in length; someof these ROHs were in excess of 5 Mb long. In contrast, only 0.83% of the Oimyakon animal’s genomeconsisted of…arrow_forward
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