Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 47.1, Problem 1TYK
In 1977, Rafael Guzman, a Mexican biologist, discovered a previously unknown wild relative of corn that is resistant to many of the viral diseases that infect domestic corn. Agriculturalists believe crossbreeding could improve current corn crops. In this case, biodiversity is important at which level?
- ecosystem
- community
- species
- both a and b
- genetic
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How does gene flow affect coevolution? For example, there is a coevolutionary arms race between snakes and newts. Snakes try to eat newts but they end up dying due to the newts' proudction of a toxin (TTX). In response, snakes have adapted a greater resistance to the toxin allowing them to not die.
What would the factor of gene flow do to a population like this??
Imagine that the volcano on Mt. St. Helens erupts again. All life is removed from the side of the mountain and has to recolonize. Your first task as a geneticist for United States Forest Service is to estimate the frequency of the red allele in the lupine plants that colonize the site. You know that the lupine seeds came from a nearby population where the frequency of the red allele has consistently been approximately 0.2 for many generations.
However, in the first year (i.e. first generation, before any local reproduction) on Mt. St. Helens, the red allele of this newly colonized population has a frequency of 0.9. What is the most likely explanation for this difference in allele frequency from the nearby population?
Say there is a population of plants that live in a wetland, and are adapted to tolerate both flooding and drought. One year, the wetland floods completely, and only the most water-tolerant plants are able to survive. The wetland never drains, and over many years the plants adapt to stay submerged all year. Many generations later, the wetland returns to being wet and dry, and the entire population dies out.
Is this an example of a historical constraint or genetic correlation?
Chapter 47 Solutions
Principles of Biology
Ch. 47.1 - In 1977, Rafael Guzman, a Mexican biologist,...Ch. 47.2 - Prob. 1TYKCh. 47.2 - Prob. 2TYKCh. 47.3 - Prob. 1CCCh. 47.3 - Prob. 2CCCh. 47.3 - Prob. 1BCCh. 47.3 - Prob. 1TYKCh. 47.3 - Prob. 2TYKCh. 47.3 - Prob. 3TYKCh. 47 - Prob. 1TY
Ch. 47 - Prob. 2TYCh. 47 - The idea that humans have an intimate love of...Ch. 47 - Prob. 4TYCh. 47 - Prob. 5TYCh. 47 - Prob. 6TYCh. 47 - Prob. 7TYCh. 47 - Prob. 8TYCh. 47 - Prob. 9TYCh. 47 - The American buffalo, Bison bison, is considered a...Ch. 47 - Prob. 1CCQCh. 47 - Prob. 2CCQCh. 47 - Prob. 3CCQCh. 47 - Prob. 1CBQCh. 47 - Prob. 2CBQ
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