Discussion
Species of origin of a blood stain can be detected with the help of :
Answer: B
Species of origin is determined by the precipitin test.
The precipitin test uses antisera raised against the serum proteins of a species, for example anti-human serum. When an extract of the stain meets the matching antiserum, an antigen-antibody precipitate forms (in a ring test, gel diffusion or crossover electrophoresis), showing that the blood is human or from the species tested.
The orthotoluidine test is a presumptive test for blood that does not tell the species. The absorption-inhibition and absorption-elution tests are methods for determining ABO blood group in stains.
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