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Three-point mapping and gene order

Please note that: 1) This description of two-point mapping ignores the possibility of double-crossovers (or higher-order crossovers) occurring 2) I made a mistake at the end of the video when summing the numbers of recombinant types: I switched the totals of the B-C and A-C columns. The real calculation of recombinants for B-C is 261, and for A-C is 482. Thus, the genetic distances that should be calculated are: A-B (19.92 cM), B-C (21.75 cM), and A-C (40.16 cM). 00:00 Introduction; review of two-point genetic mapping 00:48 Three-point mapping calculates three genetic distances at once 05:48 Experimental analysis of F2 generation data 07:19 Identifying the recombinant haplotypes 11:36 Calculating individual interval genetic distances (A-B, A-C, B-C) 14:43 For the next class