Family Pedigree Project Through the use of their understanding of Mendelian traits, students will complete at least a 3-generation pedigree for one of the provided traits (e.g., widow’s peak, connected or disconnect earlobes). Be sure to label the pedigree correctly (generation, male/female, etc.) according to the practice done previously. List of common Mendelian traits: Blood type Tongue Roller Widow’s Peak Straight or Hitchiker’s Thumb Connected/Disconnected Earlobes .