Campbell Biology In Focus
2nd Edition
ISBN: 9780134203072
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 22.4, Problem 2CC
Summarize evidence that the yup flower-color locus acts as a prezygotic barrier to reproduction in two species of monkey flowers. Do these results demonstrate that the yup locus alone controls barriers to reproduction between these species? Explain.
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In the fish Species a, the expression of different combinations of four Hox genes results in structural differences in tissues and organs along the anterior-posterior axis. Figure 3 shows the expression pattern of four genes, i.e. Genes 1 – 4, and the tissue produced along the embryonic anterior - posterior plane of fish Species a wild type. The influence of Hox genes on the formation of specific types of tissue can be determined by introducing gain-of-function and loss-of-function mutations in specific Hox genes. Looking at Figure 3, predict what would happen to each one of the four types of tissues, if the expression of gene 3 was expanded anteriorly by a gain-of-function mutation so that the pattern of gene 3 expression would be the same as that of gene 2.
X-value
0.95
0.84
2.72
7.83
Y-value
0.86
0.84
0.8
0.73
Flower color variation in Phlox drummondii living either in sympatry or allopatry with Phlox cuspidata has previously been
studied. Phlox drummondii exist in four colors: light blue, dark blue, light red, and dark red. Each flower color is controlled by a
specific combination of alleles. In allopatry, butterflies randomly pollinate Phlox drummondii flowers of all color types. In
contrast, non-random pollination occurs between differently colored flowers when both Phlox species are living in sympatry.
The graph depicts the relative fitness of the alleles that drive flower color in Phlox drummondii under conditions of sympatry or
allopatry with Phlox cuspidata. Label each half of the graph with the term sympatry or allopatry based on the observed trend in
the relative fitness of the alleles that control all four flower colors in Phlox drummondii.
Chapter 22 Solutions
Campbell Biology In Focus
Ch. 22.1 - Prob. 1CCCh. 22.1 - WHAT IF? Suppose you are studying two bird species...Ch. 22.2 - Contrast allopatric and sympatric speciation....Ch. 22.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 22.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 22.3 - What are hybrid zones, and why can they be viewed...Ch. 22.3 - WHAT IF? Consider two species that diverged while...Ch. 22.4 - Speciation can occur rapidly between diverging...Ch. 22.4 - Summarize evidence that the yup flower-color locus...Ch. 22.4 - MAKE CONNECTIONS Compare Figure 10.11 with Figure...
Ch. 22 - The largest unit within which gene flow can...Ch. 22 - Males of different species of the fruit fly...Ch. 22 - According to the punctuated equilibria model, A....Ch. 22 - Bird guides once listed the myrtle warbler and...Ch. 22 - Which of the following factors would not...Ch. 22 - Plant species A has a diploid number of 12. Plant...Ch. 22 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 22 - SCIENCE, TECHNOLOGY, AND SOCIETY In the United...Ch. 22 - FOCUS ON EVOLUTION Explain the biological basis...Ch. 22 - FOCUS ON INFORMATION In sexually reproducing...Ch. 22 - Prob. 11TYU
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