Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 18, Problem 23P
The flowering jungle plant Lacandoniaschismatica, discovered in southern Mexico, has a unique floral structure. Petal
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Chapter 18 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 18 - 18.1 Explain why many developmental genes encode...Ch. 18 - Bird beaks develop from an embryonic group of...Ch. 18 - 18.3 How is positional information provided along...Ch. 18 - Early development in Drosophila is atypical in...Ch. 18 - 18.5 Consider the evenskipped regulatory sequences...Ch. 18 - What is the difference between a parasegment and...Ch. 18 - Why do loss-of-function mutations in Hox genes...Ch. 18 - 18.8 Compare and contrast the specification of...Ch. 18 - Prob. 9PCh. 18 - Ablation of the anchor cell in wild type C....
Ch. 18 - 18.11 In gain-of-function and. elegans mutants,...Ch. 18 - Prob. 12PCh. 18 - Prob. 13PCh. 18 - 18.14 Given that maternal Bicoid activates the...Ch. 18 - What phenotypes do you expect in flies homozygous...Ch. 18 - The pair rule gene fushitarazu is expressed in...Ch. 18 - 18.17 In contrast to Drosophila, some insects...Ch. 18 - Prob. 18PCh. 18 - 18.19 You are traveling in the Netherlands and...Ch. 18 - 19.20 A powerful approach to identifying genes of...Ch. 18 - The Hoxd 913 genes are thought to specify digit...Ch. 18 - Three-spined stickleback fish live in lakes formed...Ch. 18 - The flowering jungle plant Lacandoniaschismatica,...Ch. 18 - 18.24 Homeotic genes are thought to regulate each...Ch. 18 - Prob. 25PCh. 18 - Basidiomycota is a monophyletic group of fungi...Ch. 18 - Prob. 27PCh. 18 - In C. elegans there are two sexes: hermaphrodite...Ch. 18 - In Drosophila, recessive mutations in the...
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- What are trumpet cells in brown algae? What type of cells do they resemble in true plants? Is their presence in brown algae a sign that brown algae are related to the ancestors of true plants, or is it just a remarkable case of convergent evolution?arrow_forwardIn Figure 20-18, what is the evidence that polyploid formation has been important in plant evolution?arrow_forwardVestigial wings Trait Wild-type Yellow Body White-eyes Eyeless Body Colour Gray Yellow Eye Colour Red Eye white Eyes absent Eyes absent Eye shape Normal Normal, Extends past tip of Small, Club- Wing shape and size shaped abdomen Antenna shape and size Normal Tan stripes at the end White end with Bristle shape and size stipes very unclear. Discuss the changes in chromosomes that contribute to the mutations tabulated in Table abovearrow_forward
- You are studying a plant with tissue comprising both green and white sectors. You wish to decide whether this phenomenon is due (1) to a chloroplast mutation of the type considered in this chapter or (2) to a dominant nuclear mutation that inhibits chlorophyll production and is present only in certain tissue layers of the plant as a mosaic. Outline the experimental approach that you would use to resolve this problem.arrow_forwardCultivated American cotton plants have a total of 52 chromosomes(2n = 52). In each cell there are 13 pairs of large chromosomesand 13 pairs of smaller chromosomes. Old World cotton plantshave 26 chromosomes (2n – 26); all large. Wild American cottonplants have 26 chromosomes; all small. 1)Propose a testable hypothesis to explain how cultivated American cotton probably originatedarrow_forwardTwo diploid species of closely related frogs, which we will callspecies A and species B, were analyzed with regard to the genesthat encode an enzyme called hexokinase. Species A has two distinctcopies of this gene: A1 and A2. In other words, this diploidspecies is A1A1 A2A2. Species B has three copies of the hexokinasegene, which we will call B1, B2, and B3. A diploid individualof species B would be B1B1 B2B2 B3B3. These hexokinase genesfrom the two species were subjected to DNA sequencing, and thepercentage of sequence identity was compared among these genes.The results are shown here. Percentage of DNA Sequence Identity A1 A2 B1 B2 B3A1 100 62 54 94 53A2 62 100 91 49 92B1 54 91 100 67 90B2 94 49 67 100 64B3 53 92 90 64 100…arrow_forward
- In a DNA-hybridization study, DNA was isolated from wheat, labeled with 32P, and sheared into small fragments . Hybridizations between these labeled fragments and denatured DNA from different plant species were then compared. The following table gives the percentages of labeled wheat DNA that hybridized to DNA molecules of wheat, corn, radish, and cabbage. What do these results indicate about the evolutionary differences among these plants? Species Percentage of wheat DNA hybridized relative to wheat Wheat 100 Cabbage 23 Corn 63 Radish 30arrow_forwardthe photos below show flowers from two Arabidopsisplants. The plant on the left is wild-type (unmutated); theother carries a mutation that causes its flowers to havesepals and petals instead of stamens and carpels. Themutation inactivated one of the plant's ABC floral identity genes. Refer to Figure 10.8 and decide which gene(A, B, or C) has been inactivatedarrow_forwardPlant breeders have long appreciated the phenomenon called hybrid vigor or heterosis, in which hybrids formed between two inbred strains have increased vigor and crop yield relative to the two parental strains. Starting in the 1930s, seed companies exploited the cytoplasmic male sterility (CMS) phenomenon in corn that was described in Problem 17 so that they could cheaply produce hybrid corn seed to sell to farmers. This type of CMS is caused by mutant mitochondrial genomes that prevent pollen formation. a. How would CMS aid seed companies in producing hybrid corn seed? Dominant Rf alleles of a nuclear gene called Restorer suppress the CMS phenotype, so that Rf- containing plants with mutant mitochondrial genomes are male fertile.arrow_forward
- What creates polyploid plants in the wild? A) Complete meiotic nondisjunction B) Complete mitotic nondisjunction in a stem of the plant C) Crossovers involving a chromosome with a large inversion D) colchicinearrow_forwardExplain the terms haploid, diploid, and polyploid. Why is polyploidy so much more common in plants than in animals? Give examples of polyploid animals. Polyploid plants may occur naturally or they may be created intentionally by agricultural scientists. List four examples of polyploid commercial crops and explain why they are superior to their diploid ancestors.arrow_forwardAloes vs. Agaves Describe 3 general similarities (analogous structures) you observed between Aloes & Agaves. Now, identify a specific example -- 1 Aloe species and 1 Agave species -- that look especially similar. List their names and clearly describe how they are alike. What environmental pressures likely drove the development of these similar traits? Explain. Now, what makes these two families different? Fill in the table below based on the lab’s video lecture or your personal observations: Geographic origin Flowers (stalk length, color) # of reproductive events Leaf characteristics Aloes Agavesarrow_forward
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