This is the first part of this series. Blood group is an important topic in medical sciences and transfusion mismatch is important in clinical aspect. In this video, genetics regarding blood groups and surface marker proteins are discussed. Timeline 0:00 Introduction 1:08 Transfusion reactions 1:56 Blood typing 2:48 Genetics of blood group system 4:00 Surface markers of red blood cells 5:10 A, B and H antigen 8:37 Blood group karyotyping