Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 19.2, Problem 3CC
MAKE CONNECTIONS Review the relationship between genotype and
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MAKE CONNECTIONS Balancing selection can maintain variation at a locus (see Concept 23.4). Based on theforaging experiments described in this chapter, devise asimple hypothesis to explain the presence of both for Rand forsalleles in natural fly populations
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Chapter 19 Solutions
Campbell Biology in Focus
Ch. 19.1 - How did Huttons and Lyells ideas influence Darwins...Ch. 19.1 - MAKE CONNECTIONS Scientific hypotheses must be...Ch. 19.2 - How does the concept of descent with modification...Ch. 19.2 - Prob. 2CCCh. 19.2 - MAKE CONNECTIONS Review the relationship between...Ch. 19.3 - Explain how the following statement is inaccurate:...Ch. 19.3 - How does evolution account for (a) the similar...Ch. 19.3 - WHAT IF? Fossils show that dinosaurs originated...Ch. 19 - Which of the following is not an observation or...Ch. 19 - Which of the following observations helped Darwin...
Ch. 19 - Prob. 3TYUCh. 19 - The upper forelimbs of humans and bats have fairly...Ch. 19 - DNA sequences In many human genes are very similar...Ch. 19 - SCIENTIFIC INQUIRY DRAW IT Mosquitoes resistant to...Ch. 19 - FOCUS ON EVOLUTION Explain why anatomical and...Ch. 19 - FOCUS ON INTERACTIONS Write a short essay (about...Ch. 19 - SYNTHESIZE YOUR KNOWLEDGE This honeypot ant (genus...
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- VISUAL SKILLS Consider a population in which heterozygotes at a certain locus have an extreme phenotype(such as being larger than homozygotes) that confersa selective advantage. Compare this description to themodels of selection modes shown in Figure 23.13. Doesthis situation represent directional, disruptive, or stabilizing selection? Explain your answer.arrow_forwardMAKE CONNECTIONS Describe how Tiktaalik’sfeatures illustrate Darwin’s concept of descentwith modification (see Concept 22.2).arrow_forwardINTERPRET DATA Compare the two graphs in Figure 1-17. What information does the second graph illustrate? What possible explanation can you give for the differences shown in the two graphs? (a) Number of chimpanzees who successfully employed specific method of tool use. (b) Number of chimpanzees who successfully employed learned method of tool use two months later. Figure 1-17 An experiment testing learning in chimpanzee populations In the photo, wild chimpanzees are shown observing a member of their group using a tool.arrow_forward
- MAKE CONNECTIONS If a population stopped reproducing sexually (but still reproduced asexually), how wouldits genetic variation be affected over time? Explain.(See Concept 13.4.)arrow_forwardWHAT IF? If the frequency of the CRallele were 0.6, predict the frequenciesof the CRCR, CRCW, and CWCW genotypes.arrow_forwardCan the frequencies of all genotypes in a population be determined directly with respect to a locus that has only two alleles: one dominant and the other recessive?arrow_forward
- Please answer fast 1. How would immigration affect allele frequency? Write a protocol for a simulation testing the effects of immigration on a population. Your new phenotype will be garbanzo beans. Write in a low immigration scenario (one individual per generation) and a high immigration scenario (five individuals per generation). 2. Based on the simulations you’ve already done, what is your hypothesis for how the garbanzo bean frequency will change over four generations?arrow_forwardQ89. Explain why evolution would favor the emergence of new incompatibility alleles, making the gene increasingly polymorphic in populations of tomatoes or petunias.arrow_forwardWHAT IF? In 2005, Icelandic scientists reported findinga large chromosomal inversion present in 20% of northern Europeans, and they noted that Icelandic womenwith this inversion had significantly more children thanwomen without it. What would you expect to happento the frequency of this inversion in the Icelandicpopulation in future generations?arrow_forward
- INTERPRET DATA Which of the primates in Figure 18-18 is the most distantly related to humans? Explain your answer. Figure 18-18 Differences in DNA nucleotide sequences as evidence of evolutionary relationships Comparing the same gene in different organisms provides a window into evolution. Here the differences in the non-protein-coding region of the -globin gene are compared between humans and other primates. Evolutionary biologists are rapidly expanding such studies from comparing one or several genes to comparing entire genomes.arrow_forwardWHAT IF? The increased fertility of the experimental hybrids could haveresulted from natural selection for thriving under laboratory conditions.Evaluate this alternative explanation for the result.arrow_forwardSolve for the genetic structure of a population with 12 homozygous recessive individuals (yy), 8 homozygous dominant individuals (YY), and 4 heterozygous individuals (Yy).arrow_forward
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