Campbell Biology (11th Edition)
Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 23.3, Problem 2CC

Distinguish genetic draft from gene flow in terms of (a) how they occur and (b) their irnplications for future genetic Variation in a population.

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Distinguish genetic drift from gene flow in terms of(a) how they occur and (b) their implications for futuregenetic variation in a population.
1a) Define the term linkage disequilibrium. (b) Explain why it makes sense that natural selection can maintain linkage disequilibrium between two loci that are not physically linked when there is epistasis for fitness. (c) Explain the role of linkage disequilibrium in employing QTL mapping as a way to investigate the genetic architecture of adaptive traits.
The use of nucleotide sequence data to measure genetic variability is complicated by the fact that the genes of higher eukaryotes are complex in organization and contain 5′ and 3′ flanking regions as well as introns. Researchers have compared the nucleotide sequence of two cloned alleles of the g-globin gene from a single individual and found a variation of 1 percent. Those differences include 13 substitutions of one nucleotide for another and 3 short DNA segments that have been inserted in one allele or deleted in the other. None of the changes takes place in the gene’s exons (coding regions). Why do you think this is so, and should it change our concept of genetic variation?
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