Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Chapter 22, Problem 1AWK
Summary Introduction
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The way in which different breeds of dogs with distinct characteristics were evolved even when they belong to the same species and capable of interbreeding.
Introduction:
Evolution explains the diversity of life on Earth. Evolution is defined as an unpredictable and natural process of descent over time with genetic modification. An important aspect of the evolutionary theory is natural selection. Natural selection means that individuals with certain traits are better suited to their local environment compared to other individuals who lack those traits. Therefore, the former is more likely than the latter to survive and reproduce.
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According to Darwin’s model of evolution, evolution can only occur if there is some variation present among the individual members of a population. Which statement best describes the source of this variation among members of a species?
A) individuals will vary depending on geography and climate
B) variation exists because not all genes will be expressed
C) variation among individuals may arise as a result of mutations in the genetic code
D) variation exists because different individuals will have different access to food and other resources
The dog breed West Highland Terrier is a product of artificial selection. Give a brief description of the breed and its desired traits. What wild ancestor did it come from? Was it produced with selective breeding or genetic engineering (i.e. genetically modified)? What are the benefits of artificial selection in this case? Are there potential negative consequences?
Crawfish are shelled organisms that live in shallow freshwater rivers. They can have antennae of different lengths. Two parents with medium length antennae have offspring. One of their offspring has short antennae, and one has long antennae. How did the offspring end up with traits that are different from the traits of their parents? How did the gene combinations result in these traits?
Chapter 22 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 22 - Do you think the skeletons of Liang Bua Cave...Ch. 22 - Is it important that we try to discover the...Ch. 22 - Describe the three key elements of evolution.Ch. 22 - Explain how a fossil is created.Ch. 22 - List some of the main sources of evidence for...Ch. 22 - Prob. 4CRCh. 22 - Prob. 5CRCh. 22 - Prob. 6CRCh. 22 - Explain how rising atmospheric concentrations of...Ch. 22 - List the features that make Hominidae different...
Ch. 22 -
9. Describe the origins of Homo sapiens.
Ch. 22 - Explain why racial differences may disappear...Ch. 22 - Prob. 1TYCh. 22 - Prob. 2TYCh. 22 - Prob. 3TYCh. 22 - Vestigial structures, homologous structures, and...Ch. 22 -
5. Which of the following statements about...Ch. 22 - Which of the following best describes evolutionary...Ch. 22 - Prob. 7TYCh. 22 - Genetic drift is most likely to affect: a. every...Ch. 22 -
9. Which of the following would be described as...Ch. 22 - Which of the following statements is true? a. Mass...Ch. 22 - In what order did events occur that led to life on...Ch. 22 - Prob. 12TYCh. 22 -
13. Which of the following statements about the...Ch. 22 - Prob. 14TYCh. 22 - Which of the following is not believed to be a...Ch. 22 - Prob. 1AWKCh. 22 - Prob. 2AWKCh. 22 - Critics of evolution often charge, correctly as it...Ch. 22 - Prob. 4AWKCh. 22 - Prob. 5AWKCh. 22 - It is believed that humans evolved in Africa and...Ch. 22 - Prob. 7AWKCh. 22 - Of all the great evolutionary advances of life on...
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- Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. not graded use photoarrow_forwardAccording to Darwin’s model of evolution, evolution can only occur if there is some variation present among the individual members of a population. Which statement best describes the source of this variation among members of a species? A) variation exists because different individuals will have different access to food and other resources B) individuals will vary depending on geography and climate C) variation exists because not all genes will be affected D) variation among individuals may arise as a result of mutations in the genetic codearrow_forwardAssume that a lineage of rainbow trout accumulates mutations over time that make the trout a uniform dark brown with orange spots and produce a dorsal fin shape that is very different from all other rainbow trouts. This group of rainbow trouts also has lips that are twice the size of other rainbows and they have a much narrower body. How do we know when the natural selection of such characteristics results in a new species of fish?arrow_forward
- If natural selection can only operate on existing variants, where does all that variation come from? If, as Darwin (1868) and Huxley concluded, variation arose from changes in development, then how could the development of an embryo change when development is so finely tuned and complex?arrow_forwardAccording to "The Complex Evolution of Homo sapiens", what is the significance of the L3 gene and who was the L3 woman? A.Only individuals within North and South America descended from the L3 woman. B.All individuals within Africa are descended from the L3 woman. C.All individuals outside of Africa and who live in the Old World are descended from the L3 woman. D.All individuals outside of Africa are descended from the L3 womanarrow_forwardNatural selection and artificial selection or selective breeding can both cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but selective breeding only occurs when humans intervene. Changes in genetic traits have occurred over generations through both natural selection and selective breeding although the occur through different means. What characterizes only artificial selection? Choose all that apply. A) chickens that lay larger eggs are favored B) selection increases the chances of surviving C) selection make a species stronger and fit for survival D) selection favors the desired characters in the new organismsarrow_forward
- What was Darwin's original insight that led to his theory of evolution? A) Plants and animals can be modified by human-controlled selective breeding. B) Genes, which are passed along through eggs and sperm, can only provide some of the hereditary foundation for evolution. C) Breeding in nature is selective and can produce changes in living things over generations. D) Mutation in the 23rd chromosome is the ultimate source of all genetic variation.arrow_forwardIn your own words, explain the difference between ancestral and derived traits.arrow_forwardOne of the lines of evidence that led Darwin to the theory of natural selection was his study of artificial selection. Plant breeders and pigeon breeders select offspring with specific traits in mind beforehand. a) However, since humans are an integral part of the natural world, do you think that artificial selection might be more appropriately termed “natural selection”? Why?arrow_forward
- If two groups of mice live on opposite sides of a river, they are two separate species. What two processes must have occurred in order for them to have become separate species?arrow_forward1) Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed.arrow_forward1) Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? A) The finches evolved traits to help them survive in different environments. B) The finches had different traits that influenced the environment in which they chose to live. C) Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive. D) Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. Not gradedarrow_forward
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FOSSIL FRIDAY: Primate Evolution | Grades 7-10; Author: Museum of the Rockies;https://www.youtube.com/watch?v=9tVLfvm3AFk;License: Standard YouTube License, CC-BY