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Table 1 Conditional Distributions of Offspring Genotypes for X-linked markers. Table 1 displays the conditional distributions of the offspring genotypes when testing for linkage for markers on the X-chromosome. A dot, ·, indicates a missing parent, and "c. p." denotes "conditional probability".

From: EFBAT: exact family-based association tests

Parents' genotypes Children's genotypes Conditional distribution
(AA, ·) Any Observed data have c. p. 1.
(AB, ·) {AB}, {AB, A}, Observed data have c. p. 1
  {AB, B} or {AB, A, B} Daughters have c. p. 1; sons assigned A or B with pr. 1/2.
(AB, ·) {AA}, {AA, AB}, {AA, AB, A}, {AA, AB, B}, or {AA, AB, A, B} Randomly assign AA and AB with pr. 1/2 to each daughter and A and B to each son with pr. 1/2, discarding outcomes without an AA daughter.
(·, A) {A}, {AA}, {AA, A} Observed data have c. p. 1.
(·, A) {B}, {AB}, or {AB, B} Observed data have c. p. 1.
(·, A) {A, B}, {AA, B}, {AB, A}, {AB, A, B}, {A, B, AA},{AA, AB}, {AA, AB, A}, or {A, B, AA, AB} Randomly assign AA and AB to daughters with pr. 1/2 and A and B to sons with pr. 1/2, discarding outcomes without at least one AA daughter or A son and at least one child with a B allele.
(·, ·) {A}, {AA}, or {AA, A} Observed data have c. p. 1.
(·, ·) {AB} or {AB, A} Observed data have c. p. 1.
(·, ·) {AA, B}, {AA, A, B}, {AA, AB}, {AA, AB, A}, {AA, AB, B}, or {AA, AB, A, B} Randomly assign AA and AB to daughters with pr. 1/2 and A and B to sons with pr. 1/2, discarding outcomes without at least one AA daughter or A son and at least one child with a B allele.
(·, ·) {A, B} or {AB, A, B} Daughters have c. p. 1; randomly assign A and B to each son with pr. 1/2, discarding outcomes without at least one A and one B son.