Table 1 Joint genotype probability for a sib pair (genotypes are unordered)

$q^4+p{q}^3+\frac{1}{4}{p}^2{q}^2$

$P_0^2+\frac{1}{2}{P}_0{P}_1+\frac{1}{16}{P}_1^2$

pq²(1 + q)

$P_0{P}_1+\frac{1}{4}{P}_1^2$

$\frac{1}{2}{p}^2{q}^2$

$\frac{1}{8}{P}_1^2$

pq(1 + pq)

$\frac{1}{2}{P}_0{P}_1+\frac{1}{4}{P}_1^2+\frac{1}{2}{P}_1{P}_2+2P_0{P}_2$

p²q(1 + p)

$\frac{1}{4}{P}_1^2+P_1{P}_2$

$\frac{1}{4}{p}^2{q}^2+p^{3}q+p^4$

$\frac{1}{16}{P}_1^2+\frac{1}{2}{P}_1{P}_2+P_2^2$