
Comparison of the number of nonsynonymous (dn ) and silent (ds ) substitutions per site within house finches for exon 2 in Came–DAB1 (n=9), a functional chicken gene (n=12), and a “nonclassical” class II chicken gene (n=3). These comparisons were made with a number of chicken sequences downloaded from GenBank (Zoorob et al. 1993) and the nine inferred haplotypes from house finches obtained through PCR amplification, direct sequencing, and analysis using HAPINFER as described in text. The dn and ds values were calculated by the Jukes-Cantor method of Nei and Gojobori (1986) using the MEGA software package (Kumar et al. 1993).











