Figure 8:

Ratios of X-chromosomal and autosomal mean coalescence times. Each point represents a ratio of coalescence times for a specified mixture of two types of consanguinity, depicted on the x and y axes. (A) Within individuals, matrilateral parallel and patrilateral consanguinity (Eq. 39/Eq. C4). (B) Between individuals, matrilateral parallel and patrilateral consanguinity (Eq. 40/Eq. C5). (C) Within individuals, matrilateral cross and patrilateral consanguinity (Eq. 39/Eq. C4). (D) Between individuals, matrilateral cross and patrilateral consanguinity (Eq. 40/Eq. C5). In each panel, the minimal ratio is indicated (obtained by setting matrilateral consanguinity to 1 and patrilateral consanguinity to 0), as is the maximum (obtained by setting matrilateral consanguinity to 0 and patrilateral consanguinity to 1). The value $\frac{3}{4}$ occurs with no consanguinity, located at the origin in each panel. Values greater than $\frac{3}{4}$ appear in blue, indicating combinations of parameter values that bring expected X chromosomal coalescence times closer to expected autosomal coalescence times. Values that reduce X chromosomal coalescence times to a greater extent than on autosomes, thereby shifting the ratio less than $\frac{3}{4}$, appear in red. Contour lines divide [$\frac{8}{17}$, 1] into equal-sized intervals.