Fig. 3.

(A) Absence of a significant relationship between the population recombination rate ($\rho$), averaged across populations, and physical length of chromosomes (least-squares regression slope $=$ 0.00027 (0.00021); $r^2=0.14$; $P=0.22$). (B) Weak relationship between the population recombination rate ($\rho$) and the crossover intensity for chromosomal regions obtained from the genetic maps (regression slope $=$ 0.00101 (0.00044); $r^2=0.15;$$P=0.031$). The SEs of individual estimates of all plots are on the order of the widths of the points or smaller.