Correlation between the intermarker distances in the chicken genome (y-axis) and in Alligator (A), Turtle (B) and Emu (C) (x-axis). Each dot represents the average length of the high quality paired mapped hits for one BAC clone. The linear regression and the confidence curve fits are drawn in thick and dotted lines, respectively. The estimated parameters and P-values for the regression for each species are: Alligator: slope, 0.46; intercept 6570; R2 = 0.48, P < 0.0001. Turtle: slope, 0.56; intercept 7680; R2 = 0.45, P < 0.0001. Emu: slope, 0.67; intercept 32240; R2 = 0.16, P < 0.09.