The Promoting Active Learning & Mentoring (PALM) Network, a partnership between several communities including GSA, supports the incorporation of student-centered, evidence-based learning techniques into undergraduate education by partnering PALM fellows with experienced faculty. As founding members of this fellowship, we worked together to design an instructional unit on meiotic recombination and genetic linkage for a large-enrollment undergraduate genetics course. We selected meiotic recombination and linkage to capitalize on the research experience of the fellow in meiotic recombination and the faculty mentor’s expertise in genetics education research and access to a large-enrollment class. Furthermore, previous work has shown that undergraduate genetics students struggle to integrate how linkage, recombination, and chromosome dynamics fit together in a unified model for heredity. In addition, the process of recombination is often introduced only as the mechanism for allowing gene mapping, rather than a fundamental biological process required for proper completion of meiosis and a critical driver of evolutionary diversity required for natural selection. Our instructional unit addresses these concepts through clicker questions with peer discussion, chromosome modeling, and in-class small group activities. To assess the impact of this instructional unit we: 1) examined student pre/post performance on the Genetics Concept Assessment, which contains questions about linkage and the arrangement of alleles on chromosomes, 2) used student responses to clicker questions to provide formative assessment feedback, and 3) measured student performance on summative assessments including homework and exams. We also examined instructional practices of the fellow using the Classroom Observation Protocol for Undergraduate STEM (COPUS), which records the behaviors of the instructor and students. Results of these assessments and plans to further improve the learning unit will be presented along with feedback on the effectiveness of the lesson from student surveys.