Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Chapter 21, Problem 8TYU
SYNTHESIZE YOUR KNOWLEDGE
Insects have three thoracic (trunk) segments. While researchers have found insect fossils with pain of wings on all three segments, modern insects have wings or related structures on only the second and third segment. It turns out that in modern insects, Hox gene products act to inhibit wing formation on the first segment The treehopper insect (above) is somewhat of an exception. In addition to having wings on its second segment, the treehopper's first segment has an ornate helinet that resembles a set of thorns, which a recent study has found to be a modified, fused pair of "wings." the thorn-like structure helps to Camouflage the treehopper In tree branches, thus reducing its risk of predation. Explain how changes in gene regulation could have led to the evolution of such a structure.
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11. What did we learn about the size of our genome? Why was it surprising
12. Why did Darwin think snakes evolved from animals with legs? What other animals
have "lost" their legs?
13. What causes genetic switches to turn on and off?
13. What causes genetic to switches to turn on and off the regulation which is an important part of
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The homeotic mutation Antennapedia causes mutant Drosophila to have legs in place of antennae and is a dominant gain of-function mutation. What are the properties of such mutations?How does the Antennapedia gene change antennae into legs?
An organism has a relatively large number of Hox genes in its genome. Which of the following is true
of this organism?
Select one:
А.
Its Hox genes cooperate to bring about sexual maturity at the proper stage of development.
В.
Most of its Hox genes owe their existence to gene fusion events.
С.
The organism must have multiple paired appendages along the length of its body.
D.
These genes are fundamental, and are expressed in all cells of the organism.
E.
The organism has the genetic potential to have a relatively complex anatomy.
Chapter 21 Solutions
Bio 121 Campbell Biology Truman College
Ch. 21.1 - Describe the whole-genome shotgun approach.Ch. 21.2 - Prob. 1CCCh. 21.2 - Explain the advantage of the systems biology...Ch. 21.2 - MAKE CONNECTIONS The ENCODE pilot project found...Ch. 21.2 - MAKE CONNECTIONS In Concept 20.2, you learned...Ch. 21.3 - The best estimate is that the human genome...Ch. 21.3 - The Genomes Online Database (GOLD) Website of the...Ch. 21.3 - WHAT IF? What evolutionary processes might...Ch. 21.4 - Discuss the characteristics of mammalian genomes...Ch. 21.4 - VISUAL SKILLS Which of the three mechanisms...
Ch. 21.4 - Contrast the organizations of the rRNA gene family...Ch. 21.4 - MAKE CONNECTIONS Assign each DNA segment at the...Ch. 21.5 - Describe three examples of errors in cellular...Ch. 21.5 - Explain how multiple exons might have arisen in...Ch. 21.5 - What are three ways that transposable elements are...Ch. 21.5 - WHAT IF? In 2005, Icelandic scientists reported...Ch. 21 - How did the Human Genome Project result in more...Ch. 21 - What has been the most significant finding of the...Ch. 21 - Compare genome size, gene number, and gene density...Ch. 21 - Explain how the function of transposable elements...Ch. 21 - How could chromosomal rearrangements lead to the...Ch. 21 - What type of Information can be obtained by...Ch. 21 - Bioinformatics intludes all of the following...Ch. 21 - Homeotic genes (A) encode transcription factors...Ch. 21 - Prob. 3TYUCh. 21 - DRAW IT Below are the amino acid sequences(using...Ch. 21 - EVOLUTION CONNECTION Genes important in the...Ch. 21 - scientific inquiry The scientists mapping the SNPs...Ch. 21 - Prob. 7TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE Insects have three...
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