Discussion
Which of the following tests is best suited for species determination from semen stains ?
Answer: C
The best test is cross over electrophoresis.
Species origin is decided by an antigen-antibody reaction with species-specific antisera. In crossover electrophoresis (counter-immunoelectrophoresis), the extract of the stain and the antiserum are placed in wells in a gel and an electric current drives them towards each other, so a precipitin line forms quickly where they meet. Driving the reactants together makes it much more sensitive and faster than the simple precipitin test, which suits the small amounts of protein in a dried semen stain.
The ring precipitin test works on the same reaction, but it is less sensitive. Gel electrophoresis alone separates proteins without identifying the species, and the inhibition test is used for blood grouping.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development