Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Essential Biology (with Physiology chapters) (6th Edition)
6th Edition
ISBN: 9780134018614
Author: Eric J. Simon, Jean L. Dickey, Kelly A. Hogan, Jane B. Reece
Publisher: PEARSON
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Chapter 14, Problem 16BS
Summary Introduction
To explain: Some people think that the endangered status of the red wolf should be withdrawn and
Introduction: The endangered species is a species whose number have fallen to a critically low level and are likely facing the threat of extinction. The extinction of the species occurs due to loss of habitat and due to loss of
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The current wild population is estimated to be about 50 individuals. However, a new threat to red wolves has arisen: hybridization with coyotes (Canis latrans), which have become more numerous in the areas inhabited by red wolves. Although red wolves and coyotes differ in morphology and DNA, they are capable of interbreeding and producing fertile offspring. Social behavior is the main reproductive barrier between the species and is more easily overcome when same-species mates are rare. For this reason, some people think that the endangered status of the red wolf should be withdrawn and resources should not be spent to protect what is not a “pure” species.
In the United States, the rare red wolf (Canis lupus) has been known to hybridize with coyotes (Canis latrans), which are much more numerous. Although red wolves and coyotes differ in terms of morphology, DNA, and behavior, genetic evidence suggests that living red wolf individuals are actually hybrids. Red wolves are designated as an endangered species and hence receive legal protection under the Endangered Species Act. Some people think that their endangered status should be withdrawn because the remaining red wolves are hybrids, not members of a "pure" species. Do you agree? Why or why not?
A
A Ao
Question 45
The atmosphere is an important source of both carbon and oxygen in
aquatic systems.
Question 45 options:
A) True
B) False
Question 46
Energy sources from within an aquatic system are known as allochthonous.
Question 46 options:
A) True
B) False
Question 47
Cooperative breeding is more likely to occur
Question 47 options:
A)
when inbreeding has no effect.
B)
when successful dispersal is difficult.
C)
when most individuals are unrelated.
D)
when long-distance dispersal is possible.
Chapter 14 Solutions
Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Essential Biology (with Physiology chapters) (6th Edition)
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- a) Which species is more closely related to the Gray wolf, the Maned Wolf or the jackal (or are they equally related)? b) Which species is more closely related to the jackal, the Maned wolf or the South American foxes (or are they equally related)?arrow_forwardThe pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? a) The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.arrow_forwardIn 1970, Atlantic leatherback sea turtle populations were very low, and the U.S. Fish and Wildlife Service listed the species as endangered. Over the next several decades, steps were taken to protect turtle nests and prevent accidental killing of turtles at sea by fishing fleets. As a result, the population of leatherbacks nesting on beaches in Florida has been growing exponentially (FIG. E31-3). What factors probably contributed to this exponential growth? Can exponential growth continue? If not,what factors are likely to cause the population to stabilize?arrow_forward
- In the bighorn sheep population of North America, what would happen if all of the large-bodied, large-horned males were hunted, leaving only small-bodied, small-horned sheep? a)Males could no longer protect females from predators, so eventually all of the sheep would be eaten by predators. b)There would be no phenotypic variation in the population of sheep, and natural selection could not lead to males with larger horns in the future. C)The size of horns would no longer be a heritable traits, and would males would not pass this trait to their offspring. d)Males would begin to use their horns for other behaviors, such as hunting prey or being better competitors.arrow_forwardImagine three islands, each with a population of frogs. There are approximately 1,100 frogs on Island 1, 400 on Island 2, and 400 on Island 3. Researchers estimate that these populations have been separated for 800 years. Individuals in these populations show variation in markings on their body by shape and color. Frogs on Islands 1 and 2 have circle markings that are either red, blue, or purple. All frogs on Island 3 have yellow triangle markings. The islands recently became a tourist destination, with new passenger boats connecting Island 1 and Island 2, and Island 1 and Island 3 (there is no boat that goes between Island 2 and Island 3). part 1:If frogs from Island 1 migrate to Island 3 but are unable to reproduce with the frogs on Island 3, then these populations would be classified as different species according to the Biological Species concept. agree or disagree part2: If frogs are able to sneak onto boats and move between the islands via the current routes, then gene flow…arrow_forwardImagine three islands, each with a population of frogs. There are approximately 1,100 frogs on Island 1, 400 on Island 2, and 400 on Island 3. Researchers estimate that these populations have been separated for 800 years. Individuals in these populations show variation in markings on their body by shape and color. Frogs on Islands 1 and 2 have circle markings that are either red, blue, or purple. All frogs on Island 3 have yellow triangle markings. The islands recently became a tourist destination, with new passenger boats connecting Island 1 and Island 2, and Island 1 and Island 3 (there is no boat that goes between Island 2 and Island 3). Would a biologist agree or disagree with the following statements? part 1: It is possible that yellow or triangle markings exists on Island 1 at some point in the past. Question options: Agree Disagree part 2: Genetic drift is not occurring on Island 1. Question options:…arrow_forward
- Imagine three islands, each with a population of frogs. There are approximately 1,100 frogs on Island 1, 400 on Island 2, and 400 on Island 3. Researchers estimate that these populations have been separated for 800 years. Individuals in these populations show variation in markings on their body by shape and color. Frogs on Islands 1 and 2 have circle markings that are either red, blue, or purple. All frogs on Island 3 have yellow triangle markings. The islands recently became a tourist destination, with new passenger boats connecting Island 1 and Island 2, and Island 1 and Island 3 (there is no boat that goes between Island 2 and Island 3). Would a biologist agree or disagree with the following statements? part 1 The current boat routes will decrease the likelihood of a speciation event occurring between the frog populations on Islands 2 and 3 in the future. Question options: Agree Disagree part 2 The observation that…arrow_forwardNew Zealand snapper populations were found to be under the influence of genetic drift, suggesting overfishing was still an issue for them, despite the New Zealand fisheries estimating their total population size to be over 3 million. Which of the following is the best explanation for this observation? A) Pelagic fish, like the New Zealand snapper, often only have a few reproductive individuals, therefore their effective population size is actually much smaller than the total population size. B) Pelagic fish, like the New Zealand snapper, often have an equal sex ratio which affects the number of breeding individuals. C) Pelagic fish, like the New Zealand snapper, often have disassortative mating which affects the number of breeding individuals. D) Pelagic fish, like the New Zealand snapper, often have assortative mating which affects the number of breeding individuals.arrow_forwardTests on wild cheetahs have shown that there is low genetic diversity among individuals. Wildlife biologists and conservationists are worried about what this means for the survival of this species. Why is low genetic variability a big problem when it comes to a species survival in a changing habitat?arrow_forward
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