A) the individual having the trait or disorder from whom the pedigree is initiated. B) the medical geneticist who analyzes the pedigree to find the mode of inheritance for the disorder. C) the parents of the first child in the family to show the trait or disorder. D) one of the grandparents or great grandparents who are in the first generation of the pedigree. E) the most common software package that geneticists use to analyze pedigrees.