This article presents an activity that uses sandwich bags to represent an individual's genome (their genetic make-up), and two variations of various objects representing the alleles of various genes. This activity includes the major components of an introductory genetics unit: from gamete production through probabilities of expected offspring (using Punnett squares) and the assembly of sample offspring with alleles passed down the generations. Using concrete models to represent traits and following these traits for three generations allows for a more comprehensive genetics overview than other activities found in the published literature. The consistency of the analogy allows the user (teacher or student) to better recognize the interrelationships of the various topics studied. The activity can be made intricate by adding individual statistical analysis of offspring produced or by using more complex phenotypic traits such as ABO blood type. Alternatively, the activity can be simplified, and completed as a whole class rather than individual pairs of students. (Contains 2 figures.)