Fig. 3. For the same traits and the selection environments given in Fig. 2, mean changes in the gene frequency for + alleles with the constraint that selection was only made among genotypes within one of three maturity types (early, medium, or late). Within each maturity type, genotypes were restricted to three of seven possible expression states in trait PH (Table 1): early (expression states 1–3), intermediate (3–5), or late (5–7). Simulations (captioned in figure) are given for selection environment–constraint combinations that contrast particularly with Fig. 2 (see text).