In Plomin, McClearn and Gora-Maslak's target article (see also Science 248: 183-188, 1990), reverse genetic approaches are emphasized for locating genes determining behavioral and pharmacogenetic traits. Furthermore, prospects for such an undertaking are presented pessimistically in that behavioral traits are asserted to be polygenic (due to the simultaneous action of variant alleles at multiple loci) and are conceptualized as being determined in large part by unshared environmental factors. We disagree with Plomin et al. in three major areas and argue the following:
(1) Forward genetic approaches involving candidate locus analysis and detailed analysis of the phenotype are of primary importance for isolating genes for behavioral traits, as for other genetic traits.
(2) Virtually all physiologic processes and metabolic pathways involve sets of genes, resulting in genetic heterogeneity (multiple genetic origins for a trait). However, polygenicity is approximately as unusual for behavioral traits as for other traits.
(3) Heritability analyses underestimate the extent to which behavioral traits are amenable to genetic analysis and have been misinterpreted to overestimate the importance of environmental factors.
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