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Biology / Campbell Biology 10 / Chapter 41 / Problem 8

Campbell Biology | 10th Edition | ISBN: 9780321775658 | Authors: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson

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The human esophagus and trachea share a passage leading from the mouth and nasal

Chapter 41, Problem 8

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QUESTION:

The human esophagus and trachea share a passage leading from the mouth and nasal passages, which can cause problems. After reviewing vertebrate evolution (see Chapter 34), explain how the evolutionary concept of descent with modification explains this imperfect anatomy.

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QUESTION:

The human esophagus and trachea share a passage leading from the mouth and nasal passages, which can cause problems. After reviewing vertebrate evolution (see Chapter 34), explain how the evolutionary concept of descent with modification explains this imperfect anatomy.

ANSWER:

Descent with modification is the concept that evolutionary change occurs over multiple generations. In the case of the human esophagus and trachea sharing a passage, this is believed to have occurred due to the changes that have been seen over millions of years in vertebrate evolution to reach the current human form. As vertebrates evolved

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