A striking characteristic of almost all of the traits of interest in behavioral medicine is that they show large individual differences, which often follow an approximate normal distribution. For behavioral traits this distribution is thought to derive from a number of nature/nurture variance components, schematically depicted in Fig. 28.1. Starting with the genes block, this scheme posits that...

changes in seed dormancy were selected during the domestication of crop plants from wild-plant species, because some features of dormancy that provide ecological advantages presented agronomic disadvantages within a farmed system. seed dormancy varies widely among seed batches, even for seeds of the same genotype, indicating large environmental influences. for genetic studies, it is essential t...