The programs POPGENE, ver 1.32 (Yeh et al. 1997) and TFPGA (Tools for Population Genetic Analysis), ver 1.3 (Miller 1999) were used to calculate, under the Hardy- Weinberg equilibrium assumption, the following parameters: 1) Recessive allele frequency and, accordingly, that of the dominant allele using the Taylor expansion method (Lynch and Milligan 1994); 2) Polymorphic loci percentage; 3) Non biased heterocigocity mean for all loci (Nei 1978), neutrality test, and exact test
of population differentiation (Raymond and Rousset 1995).