Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 12.3, Problem 2R
Summary Introduction
To review:
The difference between qualitative and quantitative variation.
Introduction:
Variation refers to the different forms of a trait, which can be present in the individuals of a population. It is controlled by the presence of different forms of a gene at a particular locus on the chromosome. Variation can be of two types: qualitative as well as quantitative.
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The original source of all genetic variation is what?
What is the ultimate cause of variation in populations?
What are Several Types of Selection in relation with genotype ?
Chapter 12 Solutions
Life: The Science of Biology
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- How many points is each fitness log worth?arrow_forwardWhat do you think is the most important type of variation and why?arrow_forwardWhat is concordance? For a polygenic or multifactorial trait such as behavior, why are identical (monozygous) twins studied? What is the advantage of studying identical twins reared apart? What should be the concordance in identical twins raised apart if a trait is purely genetic with no environmental influence? What are some genetic conditions or chromosomal abnormalities that cause changes in behavior?For example, Huntington disease; Fragile X syndrome. What is schizophrenia and why is it considered multifactorial? What is autism? Major depression? Bipolar disorder? What is: the purpose of our immune system? Our first line of defense against infection? • What are some differences between our innate immune system, and our adaptive immune system? What is an antigen? An antibody? Which cells make antibodies? What is a memory B cell? How do vaccines work? Why must HLA be matched for a successful organ transplant? Why is it difficult to find a good match?arrow_forward
- What are some of the reasons for the disparities?arrow_forwardWhat is Directional Selection ? When does Directional selection occurs ?arrow_forwardSixteen percent (16%) of the population is homozygous recessive for a trait. What are the frequencies of the dominant and recessive alleles of that trait?arrow_forward
- How would you know or identify if the causes of variation is genetic, environmental, or both?arrow_forwardDefine Bounded Populations?arrow_forwardWe have learned that the response to selection is equal to the selection differential times the narrow-sense heritability, and that the narrowsense heritability includes only the additive genetic variance. Why aren’t the dominance genetic variance and the gene interaction variance included? Why don’t they contribute to the genetic variation that is acted on by selection?arrow_forward
- According 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_forwardWhat do you think is the most important type of variation and why? (Choose only one - Morphological, Physiological, Behavioral or Sexual.)arrow_forwardWhat are "Trait-mediated indirect interactions"?arrow_forward
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