Discussion
In seminal stains examination, DNA is present in :
Answer: A
In seminal stain examination the DNA comes from the sperm.
A spermatozoon carries its DNA in the nucleus of its head. Differential extraction exploits this: the victim's epithelial cells are lysed first, and the tough sperm heads are then broken with a reducing agent such as DTT to obtain the male DNA separately.
The seminal fluid itself is a largely cell-free secretion; in a man with no sperm, any DNA has to come from the few epithelial and white cells it carries. The sperm tail holds no nucleus, and prostate-specific antigen is a protein, not a source of DNA.
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