This lesson plan outlines a biology class for 12th grade students on the principles of heredity and Mendel's laws of inheritance. The plan allocates 2 class periods of 45 minutes each. Students will be divided into groups to study examples of deviations from Mendel's laws, including incomplete dominance, codominance, epistasis, and more. They will receive a worksheet to solve problems related to these principles. Each group will then prepare a report on their findings to present and discuss with the class. At the end of the lesson, students will reflect on and evaluate their problem-solving process.