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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 Cavendish banana is the most popular fruit in the world, but is currently threatened

Chapter 13, Problem 11

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QUESTION:

The Cavendish banana is the most popular fruit in the world, but is currently threatened by extinction due to a fungal agent (see the photo). This banana variety is triploid (3n, with three sets of chromosomes) and can only reproduce through cloning by cultivators. Given what you know about meiosis, explain how the bananas triploid number accounts for its seedless condition. Considering genetic diversity, discuss how the absence of sexual reproduction might contribute to the vulnerability of this domesticated species to infectious agents.

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QUESTION:

The Cavendish banana is the most popular fruit in the world, but is currently threatened by extinction due to a fungal agent (see the photo). This banana variety is triploid (3n, with three sets of chromosomes) and can only reproduce through cloning by cultivators. Given what you know about meiosis, explain how the bananas triploid number accounts for its seedless condition. Considering genetic diversity, discuss how the absence of sexual reproduction might contribute to the vulnerability of this domesticated species to infectious agents.

ANSWER:


The triploid number of the Cavendish banana accounts for its seedless condition because it prevents meiosis from taking place, the process by which chromosomes divide and recombine in order to create new combinations of alleles. This results in the failure of pollen formation and the inab

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