A note on the rationale for estimating genealogical coancestry from molecular markers

Table 3 Features of the regression of genealogical coancestry f and identity by descent on estimators

Nb SNP	Nb replicates	Genealogical coancestry			Identity by descent
		a	b	R²	a	b	R²
p = 0.50*
100	1000	0.09	0.55	0.60	0.09	0.68	0.74
10000	50	0.09	0.87	0.95	0.09	0.91	1.00
Expected values		0.0	1.0		0.0	1.0
p_i ~ Beta(1, 1)
100	1000	0.09	0.43	0.48	0.09	0.54	0.58
10000	50	0.09	0.86	0.95	0.09	0.90	0.99
Expected values		0.0	1.0		0.0	1.0

Intercept (a), slope (b) and coefficient of determination (R²), based on simulated data with linkage, when the distribution of allele frequencies in the founders is estimated from the data
*Estimators (5) and (6) are used; **Estimators (9) and (10) are used

ISSN: 1297-9686