Final answer:
Dragged bloody finger on tile is a transfer/wipe bloodstain pattern, which occurs when blood is transferred to a clean surface. Cutting into epidermis and dermis layers of skin will result in bleeding.
Step-by-step explanation:
If a bloody finger is dragged across a clean tile surface, it would represent a type of bloodstain pattern known as a transfer or wipe pattern. This type of bloodstain occurs when an object with blood on it touches a surface that does not have blood on it, thereby transferring the blood.
Regarding the reference question presented, when an individual using a sharp knife cuts into their skin deeply enough to bleed, they would have cut through the epidermis and into the dermis layer of the skin. It is in the dermis layer where blood vessels are present, and injury to this layer will result in bleeding.