Which of the following statements is true about Mendelian disorders?
They are caused by mutations in multiple genes.
They are only transmitted through maternal inheritance.
They can be traced in a family through pedigree analysis.
They primarily affect non-human organisms.
The given text states that Mendelian disorders can be traced in a family through pedigree analysis. The pedigree analysis involves the study of family history and the inheritance pattern of a specific trait or disorder. By examining the pedigree, one can determine whether the disorder follows a Mendelian pattern of inheritance. Therefore, option 3 is the correct answer.