Pearson eText Genetic Analysis: An Integrated Approach -- Instant Access (Pearson+)
3rd Edition
ISBN: 9780135564172
Author: Mark Sanders, John Bowman
Publisher: PEARSON+
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Chapter 16, Problem 18P
When the human genome is examined, the chromosomes appear to have undergone only minimal rearrangement in the
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Although DNA transposons are abundant in the genomes of multicellular eukaryotes, class 1 elements usually make up the largest fraction of very large genomes such as those from humans (~2500 Mb), maize (~2500 Mb), and barley (~5000 Mb). Given what you know about class 1 and class 2 elements, what is it about their distinct mechanisms of transposition that would account for this consistent difference in abundance?
Mitochondrial DNA sequences have been detected in the nuclear genomes of many organisms, and cpDNA sequences are sometimes found in the mitochondrial genome. Propose a mechanism for how such “promiscuous DNA” might move between nuclear, mitochondrial, and chloroplast genomes.
What proportion of exons are repeated sequences in the human genome? Is 38% surprising?
Chapter 16 Solutions
Pearson eText Genetic Analysis: An Integrated Approach -- Instant Access (Pearson+)
Ch. 16 - You have discovered a new species of Archaea from...Ch. 16 - 16.2 Repetitive DNA poses problems for genome...Ch. 16 - 16.3 When the whole-genome shotgun sequence of the...Ch. 16 - How do cDNA sequences facilitate gene annotation?...Ch. 16 - 16.5 How do comparisons between genomes of related...Ch. 16 - 16.6 You are designing algorithms for the...Ch. 16 - 16.7 You have sequenced a region of the Bacillus...Ch. 16 - You have just obtained 100-kb of genomic sequence...Ch. 16 - 16.9 The human genome contains a large number of...Ch. 16 - Based on the tree of life in Figure 16.12, would...
Ch. 16 - 16.11 When comparing genes from two sequenced...Ch. 16 - 16.12 What is a reference genome? How can it be...Ch. 16 - Prob. 13PCh. 16 - Prob. 14PCh. 16 - 16.16 Consider the phylogenetic tree below with...Ch. 16 - You have isolated a gene that is important for the...Ch. 16 - 16.18 When the human genome is examined, the...Ch. 16 - Symbiodinium minutum is a dinoflagellate with a...Ch. 16 - Substantial fractions of the genomes of many...Ch. 16 - 16.21 A modification of the system, called the ...Ch. 16 - 16.22 A substantial fraction of almost every...Ch. 16 - 16.23 In the globin gene family shown in Figure ,...Ch. 16 - You are studying similarities and differences in...Ch. 16 - In conducting the study described in Problem 24,...Ch. 16 - Prob. 26PCh. 16 - Prob. 27PCh. 16 - Prob. 28PCh. 16 - Prob. 29P
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- The period gene of Drosophila melanogaster encodes for a stretch of Thr-Gly repeated in tandem. In natural populations, the three most common alleles encode for 17, 20 and 23 Thr-Gly repeats. The amplification by PCR of the allele encoding for 20 Thr-Gly repeats produces a fragment of 320 bp. Using the same set of primers, what is the size expected when amplifying the 17 Thr-Gly allele? 317 303 314 302 In a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive. Knowing that a plant with genotype AAbbCc has a pink flower, which genotype, among the ones listed below, will produce the same phenotype? Aabbcc. aabbcc. AaBbCc. AABBCc. In pea plants, tall (T) is dominant to dwarf (t) and yellow (Y) is dominant to green (y). In a cross of true-breeding tall yellow peas x dwarf green…arrow_forwardThe genome of Daphnia pulex, a small freshwater crustacean, includesapproximately 30,000 genes in ∼200,000 kb of DNA. How does the genome compare to that of Drosophila melanogaster, another arthropod, and to that of humans?arrow_forwardIf 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.arrow_forward
- Antibiotics such as chloramphenicol, tetracycline, and erythromycin inhibit protein synthesis in bacteria, but have no effect on the synthesis of proteins encoded by eukaryotic nuclear genes. Cycloheximide inhibits the synthesis of proteins encoded by nuclear genes, but has no effect on bacterial protein synthesis. How might these compounds be used to determine which proteins are encoded by mitochondrial and chloroplast genomes?arrow_forwardNext-generation sequencing reveals that six new mutations have occurred in the coding regions of genes in an individual diploid fly. If the coding regions of this fly comprise 100 million nucleotides per haploid genome, what is the mutation rate per nucleotide?arrow_forwardThe 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_forward
- A geneticist is trying to determine how many genes are found in a 300,000-bp region of DNA. Analysis shows that four different areas within the 300,000-bp region have H3K4me3 modifications. What might their presence suggest about the number of genes located there?arrow_forwardThe genome of Drosophila melanogaster, a fruit fly, was sequenced in 2000. However, this “completed” sequence did not include most heterochromatin regions. The heterochromatin was not sequenced until 2007 (R. A. Hoskins et al. 2007. Science 316:1625–1628). Most completed genome sequences do not include heterochromatin. Why is heterochromatin usually not sequenced in genome-sequencing projects?arrow_forwardAlthough DNA transposons are abundant in the genomes of multicellular eukaryotes, class 1 elements usually make up the largest fraction of very large genomessuch as those from humans (~2500 Mb), maize (~2500Mb), and barley (~5000 Mb). Given what you knowabout class 1 and class 2 elements, what is it about theirdistinct mechanisms of transposition that would accountfor this consistent difference in abundance?arrow_forward
- Genome duplications outside plants are relatively rare; and have only occurred a few times throughout evolutionary history. When they do occur, they tend to coincide with a change in a geological period; which is also a time of upheaval and natural change (ie. the Cretaceous–Paleogene boundary which was most likely caused by an asteroid that wiped out three-quarters of all species of life, including the dinosaurs). Which of the following statements is TRUE? A. Genome duplications are more common in plants because plants can self-fertilize B. Genome duplications are usually strongly selected against, because of problems with meiosis C. All of the statements are true D. Genome duplications allow for increased variation for selection to act on, which is beneficial in stressful environmentsarrow_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. Notice that, for the Vicia species, the rate of renaturation is much faster in the first hour and then slows down. What might cause this initial rapid renaturation and the subsequent slowdown?arrow_forwardAt the end of the short arm of human chromosome 16 (16p), several genes associated with disease are present, including thalassemia and polycystic kidney disease. When that region of chromosome 16 was sequenced, gene-coding regions were found to be very close to the telomere-associated sequences. Could there be a possible link between the location of these genes and the presence of the telomere-associated sequences? What further information concerning the disease genes would be useful in your analysis?arrow_forward
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