Alcock10e Ch03 Discussion Questions - Instructors Manual to accompany Animal Behavior Tenth Edition John Alcock Discussion Questions Chapter 3 The

Alcock10e Ch03 Discussion Questions - Instructors Manual to...

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Instructor’s Manual to accompany Animal Behavior, Tenth Edition John Alcock Discussion Questions Chapter 3: The Evolution of Social BehaviorFigure 3.3 shows a phylogeny (see page 31) of many bee species in the genus Lasioglossumwith the social system of the species superimposed on the evolutionary tree. What is the minimum number of times that eusociality (i.e., colonial species with obligately sterile workers) has evolved in this group? How many times has eusociality been lost, either completely or partially? (Partial loss of eusociality has occurred in those species that are labeled “polymorphic,” which means that in these cases some populations form colonies with sterile workers and others do not.) How might this phylogeny be used to criticize the common value judgment that complex social systems are generally superior, and more recently evolved, than simpler ones? , 3.2 Given the differences in reproductive success for the three categories of male lazuli buntings, how can we account for the evolutionary persistence of males with dull and, especially, intermediate plumage?

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