From a genetic point of view, are individuals, well, individuals? Can there be conflict between different parts of an individual’s genome? To learn about intragenomic conflict, see:
Cosmides, L. & Tooby, J. (1981). Cytoplasmic inheritance and intragenomic conflict. Journal of Theoretical Biology, 89, 83-129.
Why not clone? Why do most long-lived, low-fecundity organisms reproduce sexually? What is the adaptive function of sexual recombination? Why is there so much genetic polymorphism? To find out, see:
Tooby J. (1982). Pathogens, polymorphism, and the evolution of sex. Journal of Theoretical Biology, 97, 557-576.
Does genomic imprinting and the potential for cross-generational epigenetic inheritance select for systems that regulate development across generations? To find out, see:
Tooby, J., Cosmides, L. & Barrett, H. C. (2003). The second law of thermodynamics is the first law of psychology: Evolutionary developmental psychology and the theory of tandem, coordinated inheritances. Psychological Bulletin, 129(6), 858-865.
What is the difference between an adaptationist and a phylogenetic approach? Which is more useful for a psychologist trying to reconstruct the architecture of the human mind? To find out, see:
Tooby, J. & Cosmides, L. (1989). Adaptation versus phylogeny: The role of animal psychology in the study of human behavior. International Journal of Comparative Psychology, 2, 105-118.
What is the cognitive niche? How can behavioral ecology be used to help reconstruct hominid behavioral evolution? See:
Tooby J. and DeVore, I. (1987). The reconstruction of hominid behavioral evolution through strategic modeling. In: Primate Models of Hominid Behavior, W. Kinzey (Ed.) New York: SUNY Press.