Varying migration and deme size and the feasibility of the shifting balance.

———. 1978. A critical review of the models of group selection. Q. Rev. Biol. 53:101–114. ———. 1979. The primary characteristics of Tribolium populations group selected for increased and decreased population size. Evolution 33:749–764. ———. 1980. An experimental study of kin selection. Evolution 34:844–855. ———. 1982. Group selection: migration and the differentiation of small populations. Evolution 36:949–961. ———. 1985. The effects of genotypic interactions on evolution in structured populations. Pp. 280–293 in V. L. Choopra, ed. Genetics: new frontiers. Proceedings of the XV International Congress of Genetics. Oxford and IBH Publishing, New Delhi, India. ———. 1992. Sewall Wright: gene interaction in the shifting balance theory. Pp. 35–62 in J. Antonovics and D. Futuyma, eds. Oxford surveys of evolutionary biology. Vol. 6. Oxford Univ. Press, New York. ———. 2000. Epistasis: genetic constraint within. populations and accelerant of divergence among them. Ch. 12. in J. B. Wolf, E. D. Brodie III, and M. J. Wade, eds. Epistasis and the evolutionary process. Oxford Univ. Press, New York. In press. Wade, M. J., and C. J. Goodnight. 1991. Wright’s shifting balance theory: an experimental study. Science 253:1015–1018. ———. 1998. The theories of Fisher and Wright in the context of metapopulations: when nature does many small experiments. Evolution 52:1537–1553. Wade, M. J., and J. R. Griesemer. 1998. Populational heritability: empirical studies of evolution in metapopulations. Am. Nat. 151: 135–147. Wade, M. J., and S. Kalisz. 1990. The causes of natural selection. Evolution 44:1947–1955. Wade, M. J., and D. E. McCauley. 1980. The phenotypic and genotypic differentiation of small populations. Evolution 34: 799–812. ———. 1984. Group selection: the interaction of local deme size and migration on the differentiation of small populations. Evolution 38:1047–1058. Wade, M. J., Y. Toquenaga, and N. Johnson. 1999. Intraspecific genotype-environment variation affecting the expression of Haldane’s Rule in hybrids between flour beetle species. Evolution 53:855–865. Wagner, A., G. P. Wagner, and P. Similion. 1994. Epistasis can facilitate the evolution of reproductive isolation by peak shifts: a two-locus two-allele model. Genetics 138:533–545. Warren, D. C. 1974. Breeding. Pp. 248–276 in O. A. Hanke, J. L. Skinner, J. H Florea, eds. American Poultry History 1823–1973. American Printing and Publishing, Madison, WI. Williams, G. C. 1966. Adaptation and natural selection. Princeton Univ. Press, Princeton, NJ. Wimsatt, W. 1980. Reductionistic resarch strategies and their biases in the units of selection controversy. Pp. 213–259 in T. Nickles, ed. Scientific discovery: case studies. Reidel, Dordrecht, The Netherlands. Wolf, J. B. 2000. Indirect genetic effects and gene interactions. Ch. 10 in J. B. Wolf, E. D. Brodie III, and M. J. Wade, eds. Epistasis and the evolutionary process. Oxford Univ. Press, New York. In press. Wolf, J. B., and E. D. Brodie III. 1998. Coadaptation of parental and offspring characters. Evolution 52:299–308. Wolf, J. B., E. D. Brodie III, J. M. Cheverud, A. J. Moore, and M. J. Wade. 1998. Evolutionary consequences of indirect genetic effects. Trends Ecol. Evol. 13:64–69. Wolf, J. B., E. D. Brodie III, and A. J. Moore. 1999. Interacting phenotypes and the evolutionary process II: selection resulting from social interactions. Am. Nat. 153:254–266. Wolf, J. B., E. D. Brodie III, and M. J. Wade, eds. 2000. Epistasis and the evolutionary process. Oxford Univ. Press, New York. In press. Wright, S. 1945. Tempo and mode in evolution: a critical review. Ecology 26:415–419. ———. 1959. Physiological genetics, ecology of populations, and natural selection. Persp. Biol. Med. 3:107–151. ———. 1969. Evolution and the genetics of populations. Vol. 2. Univ. of Chicago Press, Chicago, IL.