Yes, skin cells carry DNA, but not all skin cells.
The outer layer of skin cells, known as corneocytes, are dead cells and do not have any active processes, including DNA. This layer acts as a barrier and insulator to protect the body from harm.
However, the deeper layers of skin cells, where cell division and growth occur, contain DNA. These cells are responsible for replacing the dead outer layer and maintaining the integrity of the skin.
It's important to note that even though the outer layer of skin cells does not contain DNA, they can still be used for DNA analysis because they shed from the body and leave behind their DNA. This is why "touch DNA" can be used in forensic investigations.
Example: Imagine a scenario where you touch an object. While the outer layer of your skin cells might be dead, they might still shed and leave behind a trace of your DNA on the object. This "touch DNA" can be collected and analyzed to identify you.
