Mapping genes with a three point testcross

How do we determine the order and distance between three genes using a three-point test-cross? How do we determine the parent types and double-recombinant types? How do we determine the map distance between each pair of genes? This video lecture was recorded at the University of Wisconsin -- Stout in the fall of 2021. It accompanies my BIO 332 Genetics course, which was taught with Hartl's "Genetics: Analysis of Genes and Genomes."