Loose-leaf Version for What is Life? A Guide to Biology
3rd Edition
ISBN: 9781464172274
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 8, Problem 17SA
Summary Introduction
To analyze:
Example of a trait that was selected for one function but was later modified to serve a different function.
Introduction:
There are several traits in the course of evolution that were intended for one purpose but they later got modified as a result of evolution to serve a different purpose.
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With the help of suitable diagram, represent the operation of naturalselection on different traits.
Describe the effects of selective breeding.
Describe and give examples of how genes and theenvironment determine traits.
Chapter 8 Solutions
Loose-leaf Version for What is Life? A Guide to Biology
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- GIVE TWO EXAMPLES OF SPECIFIC TRAITS AND HOW THEY ARE CHANGEDarrow_forwardIs the ability to modify traits an organism carries a new technology? Explainarrow_forwardWrite a short explanatory essay on the following statement: “Incases of genetically programmed phenotypic plasticity, naturalselection acts on the norm of reaction. Thus the norm of reactionas a whole—rather than any one phenotype—determines ifselection is positive or negative.”arrow_forward
- The picture below shows an example of descent with modification. Identify what modification is shown and propose a purpose for it.arrow_forwardThe text explains that selective breeding involves breeding animals or plants for specific desirable traits. For example, humans bred different types of dogs to accomplish certain jobs. Farmers breed chickens for having meat and laying a greater amount of eggs. Cattle are often selectively bred either for more meat or for more milk production. The text also notes that breeding animals for size and strength interferes with natural animal processes. Based on this information presented in the text, who benefits from the traits different animals are bred for? a) humans breeding the animals b) the animals being bred by the humans c) both the humans breeding the animals and the animals being bred by the humans d) animals not being bred by humansarrow_forwardMAKE A simple sketch and label characteristics Choose a human-related organism to study. As you consider strategies to enhance the social value of this organism, think of other desirable attributes that may be added to it. Imagination is a powerful tool, so let it go wild and imagine that you can transfer genes across other animals. For example: A gene from a firefly has been transferred into tobacco plants so that they may glow in the dark, as demonstrated by geneticists. Tobacco pests are less likely to attack at night because of this.arrow_forward
- Use an example to describe how genetic equilibrium can be usedas a benchmarkarrow_forwardGive at least one example of why certain complicated qualities are also known as quantitative traits.arrow_forwardFind a human trait that has an environmental effect (such as temperature-sensitive, metabolic intervention, etc.) and describe the phenotype with and without the environmental effect.arrow_forward
- What are some traits that make a good model organism? Describe at least three traits.arrow_forwardAccording to Amar J. S. Klar, is there a such thing as “left handedness”? What is the preferred term? Describe how the genetics works, according to his hypothesis. What are the alleles, and which combinations of alleles make for which type of hand use?arrow_forwardCompare conventional breeding, mutation breeding, and genetic engineering. Give at least three (3) advantages and disadvantages of conventional breeding.arrow_forward
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