Fig. 1From: A powerful parent-of-origin effects test for qualitative traits on X chromosome in general pedigreesThree pedigree structures used for the simulation study. The (a), (b) and (c) parts represent two-, three- and four-generation pedigrees, respectively. The squares are males, and the circles are females. The rhombus could be any gender. “/” denotes that the genotype of the individual is missingBack to article page