References 79not reflect the way personality is organized at a genetic level.
An equally feasible structure would involve considerable dif-
ferences in complexity across domains. Some domains may
consist of a relatively large number of traits, whereas others
may consist of only one or two genetically homogeneous
traits. These assumptions are consistent with the lexical view
of Saucier and Goldberg (1996), who argued that the five do-
mains are merely a convenient way of organizing lower-order
traits and that there is no inherent reason to assume that do-
mains are equal in breadth or in pervasiveness.
Although behavioral genetic analyses show that environ-
mental factors exert a considerable influence on personality,
they do not appear to influence the structural relationships
among traits to any appreciable extent. Instead, environ-
mental factors appear to exert a more contemporaneous effect
on trait expression. The nature of these factors and the way
that they function remain important topics of research.
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