Inferred ploidy levels for each chromosome within the four surveyed lines. Each chromosome-wide measure is an average over all surveyed nonredundant sequences, scaled by the genome-wide average, so 0.5, 1.0, 1.5, and 2.0 imply monosomy, disomy, trisomy, and tetrasomy, respectively.

Microsatellites (triangles, solid lines). The three rightmost filled triangles denote direct estimates of the mutation rates for classes of microsatellites containing large numbers of repeats (n = 10, 8, and 3, respectively); the bottom filled triangle is a rough estimate of the mutation rate for the smallest class, taken to be the midpoint between the upper statistical bound (base of the arrow) and zero; fitted regression to all four points: (1.75 × 10⁻¹⁰) × L^3.60 (r² = 0.88), where L is the number of repeats. Open triangles denote estimates from two earlier studies with reporter constructs (19, 31); fitted regression: (3.24 × 10⁻¹¹) × L^3.42 (r² = 0.87). Circles, squares, and dotted lines indicate homopolymeric runs. Maximum-likelihood estimates (circles) of the mutation rate of HPR loci as a function of the run length are fitted to the regression line, with each data point representing the average result over all four MA lines, with separate points for A/T and G/C runs. The regression equation is (3.73 × 10⁻⁹) × L^3.78 (r² = 0.94). The filled squares denote direct estimates derived from sequence analysis of PCR products in this study, whereas the open squares denote results from other studies (28, 29, 32); the joint regression for these latter two sets of points is (1.50 × 10⁻¹²) × L^5.47 (r² = 0.88).