Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 43, Problem 10TYU
Summary Introduction
To describe: The relationship of the animals such as
Introduction: Photoreceptors are the sensory receptors present in the eye that detect light. These photoreceptors absorb light energy and cause a change in the action potential. Certain pigments present in the receptors called rhodopsin are sensitive to light and help in signal transduction.
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People who object to evolution sometimes assert that complex organs such as eyes are irreducibly complex, and therefore
couldn't have arisen through evolution. Which of the following are insights that evolutionary research has provided on how
complex organs arise? For each choice select YES or NO.
Eyes are often used in arguments for intelligent design because many consider this organ to be too complex to have evolved by chance alone. However, complex lensed eyes evolved independently both within cephalod mollusks and vertebrates including our own ancestor. In the evolution of these structures the corresponding phylogenies revealed that both:
A) were preceded by the evolution of 'simple' light sensing eyes, thus having adaptive intermediate evolutionary steps.
B) lacked intermediate evolutionary steps involving the evolution of 'simple' eyes.
C) had intermediate evolutionary steps, but ultimately the vertebrate eye had a superior 'design' without any kind of blind spot, relative to the simple invertebrate cephalopod eye.
D) were preceded by vestigial non-functional optic structures.
Which of the following best describes the evolution of smell in chordates?
A) Ancestrally, jawless fish had few ancestral scent genes that coded for receptors resembling a combination of water and air receptors. Subsequently these genes were duplicated and specialized through natural selection either for use in water or air.
B) Ancestrally, all olfactory receptors where specialized for water as the ancestor of all vertebrates was aquatic. Only once did olfactory genes become duplicated and specialized and this was in the transition to land for receptors that work in air.
C) All chordates share the same number of scent receptor genes. However, they have become variously deactivated through natural selection due to either unuse or a tradeoff for sight genes.
D) None of the above.
Chapter 43 Solutions
Biology (MindTap Course List)
Ch. 43.1 - How Sensory Systems Work LEARNING OBJECTIVES 1...Ch. 43.1 - Prob. 2LOCh. 43.1 - Prob. 1CCh. 43.1 - PREDICT Imagine that you are hiking along a bay...Ch. 43.1 - Prob. 3CCh. 43.1 - Identify five kinds of sensory receptors based on...Ch. 43.2 - Prob. 3LOCh. 43.2 - What are the functions of thermoreceptors in...Ch. 43.3 - Prob. 4LOCh. 43.3 - Prob. 1C
Ch. 43.3 - Prob. 2CCh. 43.4 - Describe the functions of nociceptors and identify...Ch. 43.4 - Prob. 1CCh. 43.4 - Prob. 2CCh. 43.5 - Prob. 6LOCh. 43.5 - Compare the structure and function of the saccule...Ch. 43.5 - Prob. 8LOCh. 43.5 - Prob. 1CCh. 43.5 - Prob. 2CCh. 43.5 - List the sequence of events involved in hearing.Ch. 43.6 - Prob. 9LOCh. 43.6 - Prob. 1CCh. 43.7 - Prob. 10LOCh. 43.7 - Prob. 11LOCh. 43.7 - Prob. 12LOCh. 43.7 - Prob. 1CCh. 43.7 - What happens when light strikes rhodopsin?...Ch. 43.7 - What is the sequence of neural signaling in the...Ch. 43.7 - What is meant by the statement Vision happens...Ch. 43 - Test your Understanding Know and Comprehend 1. A...Ch. 43 - Prob. 2TYUCh. 43 - Prob. 3TYUCh. 43 - Prob. 4TYUCh. 43 - Prob. 5TYUCh. 43 - Prob. 6TYUCh. 43 - Prob. 7TYUCh. 43 - Prob. 8TYUCh. 43 - Prob. 9TYUCh. 43 - Prob. 10TYUCh. 43 - Prob. 11TYUCh. 43 - SCIENCE, TECHNOLOGY, AND SOCIETY Cochlear implants...
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