PATHOLOGY

Detailed explanation-1: -Moisture and grease on a finger result in fingerprints on surfaces such as glass or metal. Deliberate impressions of entire fingerprints can be obtained by ink or other substances transferred from the peaks of friction ridges on the skin to a smooth surface such as paper.

Detailed explanation-2: -The whorls, arches and loops that make fingerprints unique are produced during fetal development by waves of tiny ridges that form on the fingertip, spread and then collide with each other-similar to the process that gives a zebra its stripes, or a cheetah its spots.

Detailed explanation-3: -A latent print results from the reproduction of friction ridges found on parts of the fingers, hands, and feet. These prints consist of a combination of different chemicals that originate from natural secretions, blood, and contaminants.