Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 17.3, Problem 3TQ
Summary Introduction
To review:
The shortcomings of the evidence available for horizontal gene transfer and their alternative explanation.
Introduction:
The scientist Carl Woese used small subunit rRNA (ribosomal ribonucleic acid) sequence analysis to classify organisms into three domains. These domains are Eukarya, Archaea, and Bacteria. The domains Eukarya and Archaea are thought to share a common ancestor and bacteria are considered to have diverged much before the divergence between Eukarya and Archaea occurred.
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Microbiology: An Evolving Science (Fourth Edition)
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- Define horizontal gene transfer. What problems does it cause for evolutionary biologists?arrow_forwardNow that cloning is possible, should it be used to clone animals that are near extinction? What are the possible ramifications of this when it comes to genetic diversity and size of the gene pool?arrow_forwardwhat is the role of gene duplication, whole genome duplication, transposable elements, and horizontal gene transffer in genome evolution?arrow_forward
- How do the following genomic features of prokaryotic organisms compare with those of eukaryotic organisms? How do they compare among eukaryotes? a. Genome size b. Number of genes c. Gene density (bp/gene) d. Number of exonsarrow_forwardA 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 * 10-9 per bp per year. What is the significance of this finding in terms of mammalian evolution?arrow_forwardIn 1995, Hamilton Smith, Craig Venter and co-workers published the first complete genome sequence of a self-sustaining organism, that of the bacterium Haemophilus influenzae. Analysis of the genome sequence revealed that the organism does not have a gene that could encode a telomerase enzyme. What is the potential evolutionary consequence of this? Explain your answer.arrow_forward
- Compare genome size, gene number, and gene density (a) in the threedomains and (b) among eukaryotes.arrow_forwardThe following two sequences represent the same gene from two different species: Assume that all changes in the third position are synonymous and all in the first and second positions are nonsynonymous. a) How many synonymous sites (positions) are there in the gene? b) How many nonsynonymous sites (positions) are there in the gene? c) How many synonymous substitutions are there between species? d) How many nonsynonymous substitutions are there between species? e) What is the dN/dS ratio? f) What does the dN/dS ratio tell you about the evolution of this sequence? Finally, It has been hypothesized that population size affects genome size. What is the proposed relationship? How can it be explained?arrow_forwardIn DNA-hybridization experiments on six species of plants in the genus Vicia, DNA was isolated from each of the six species, denatured by heating, and sheared into small fragments (W. Y. Chooi. 1971. Genetics 68:213–230). In one experiment, DNA from each species and from E. coli was allowed to renature. The graph shows the results of this renaturation experiment. Q. Can you explain why the E. coli DNA renatures at a much faster rate than does DNA from any of the Vicia species?arrow_forward
- How do these 2 diagrams fit within the scope of evolutionary genomics?arrow_forwardWhat are some possible research questions and practical applications that could be addressed by creating organisms with artificial chromosomes and synthetic genomes? What might be some potential safety, environmental, social, and ethical concerns about creating organisms with synthetic genomes?arrow_forwardselect the correct options: A) For organisms that diverged >74 mya, ignore 3rd base positions within codons because they will offer little phylogenetic information for organisms. B) use different parts ofthe genome to estimate different parts of a phylogeny C) Use only 1st base positions within codons because they increase rapidly at first, then level off as result of single subsitituions at the same sites D) Use slowly evolvong sites in the squecne, such as 2nd base positions within codonsfor analyzing the oldest relationships among organisms.arrow_forward
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