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Puerto Rico Resource Center for Science and Engineering, University of Puerto Rico, San Juan 00931-3334.
A review of recent molecular genetic investigations into sexual orientation is presented and used as a model to identify unique challenges encountered in research on complex behavior. Five main themes are presented that are generally applicable to most behavioral genetics investigations: (1) A precise definition of the phenotype that, as much as possible, unambiguously differentiates the study group from the control group must be achieved; (2) environmental and social contributions to a trait may exhibit significant sex differences; (3) subsets within the study sample may reveal important information about genetic and environmental contributions to the trait that otherwise would be missed; (4) the high degree of specificity required to define a study sample severely restricts the application of results to general populations; and (5) studies attempting to replicate data must strictly parallel the original methodology if valid comparisons are to be made.
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