This pathway examines Mendel’s landmark studies of pea plants that allowed him to discover the basic principles of heredity. Topics covered include different types of genetic crosses (specifically monohybrid, dihybrid, multihybrid, and reciprocal crosses, as well as testcrosses), the concept of dominance, and Mendel’s laws of segregation and independent assortment. It also explores the use of branch diagrams and the rules of probability to solve genetic crosses.