Fig. 3

Recombination and length distribution of segments of distinct ancestry in the analysis of X chromosome and autosomal data. A Recombination breakpoint counts. The histogram represents the simulated value of recombination breakpoints and the red curve is the theoretical Poisson distribution. Under identical simulation models and parameter settings, the average number of recombination breakpoints of the X chromosome is approximately two-thirds of that of autosomes. B Segment length distribution. The histogram represents the simulated segment length distribution and the red curve is the theoretical exponential distribution. The theoretical distribution fits quite well with the simulated one. Moreover, X chromosomes possess a smaller effective recombination rate compared to autosomes