Table 2.

IBD Transition Probabilities P(I_m+1|I_m) for a Sib Pair^[Note]

	P(Im+1|Im) for
Im	Im+1=0	Im+1=1	Im+1=2
0	ψ2m	2ψm(1-ψm)	(1-ψm)2
1	ψm(1-ψm)	ψ2m+(1-ψm)2	ψm(1-ψm)
2	(1-ψm)2	2ψm(1-ψm)	ψ2m

Note.— ψ_m=θ²_m+(1-θ_m)², where θ_m is the recombination fraction between loci m and m + 1.