Table 2.

Evaluation of the relative extent of genetic divergence versus phenotypic parallelism among lineages evolved from the same starting genotypes. (Fitness is expressed relative to the local optima genotype 01001. Errors represent ±1 s.d.)

starting genotype	initial fitness (W0)	average change in fitness	genetic variance among lineages	parallelism index (IW)
01000	0.934 ± 0.153	0.570 ± 0.429	0.068 ± 0.043	0.458 ± 0.491
00010	0.899 ± 0.171	0.489 ± 0.623	0.184 ± 0.117	0.878 ± 1.397
00001	0.847 ± 0.124	0.275 ± 0.543	0.158 ± 0.100	1.446 ± 3.314
10110	0.875 ± 0.178	1.116 ± 0.254	0.005 ± 0.003	0.063 ± 0.035
01101	0.882 ± 0.168	0.955 ± 0.283	0.012 ± 0.008	0.114 ± 0.070

^aMaximum-likelihood estimators.