Discussion
Which of the following are not useful for DNA analysis ?
Answer: D
The cells not useful for DNA analysis are erythrocytes.
Mature human red blood cells lose their nucleus during development, so they contain no nuclear DNA. The DNA typed from a blood stain comes from the white blood cells (leucocytes) in it.
Vaginal epithelial cells, buccal (cheek) cells and spermatozoa all have nuclei and are routine sources of DNA. Buccal swabs are the standard reference sample, and differential extraction separates sperm DNA from vaginal cell DNA in sexual assault cases.
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