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a.) In either a secondary or a primary hybrid zone, what do the graphs above indicate about the relative fitness of the hybrid toads away from the 0-kilometer site on the cline? Why?
b.) One explanation for the “stepped cline” in both gene frequencies and morphology is that B. bombina and B. variegata first diverged in allopatry and are now forming a secondary hybrid zone. Is the spatial pattern of genetic and morphological variation consistent with this explanation? Why or why not?
c.) What would have to be true for the ecological niches of these two-color forms of toad for disruptive selection to be acting on so many loci in parapatry?
![(A)
0.99
0.9
B. bombina
0.5
0.1
0.01
-30 -20
-10
10
20
30
40
Distance from center of cline (km)
(B)
0.99
B. variegata
0.9
0.5
0.1
0.01
-30 -20
-10
10
20
30
40
Distance from center of cline (km)
EVOLUTION 4e, Figure 9.4
© 2017 Sinauer Associates, Inc.
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