Deoxyribonucleic acid (DNA) is a molecule that encodes an organism's genetic blueprint. In other words, DNA contains all of the information required to build and maintain an organism.
Chattel slavery, also called traditional slavery, is so named because people are treated as the chattel (personal property) of the owner and are bought and sold as if they were commodities. It is the least prevalent form of slavery in the world today.
Slavery existed in Africa, but it was not the same type of slavery that the Europeans introduced. The European form was called chattel slavery. A chattel slave is a piece of property, with no rights. Slavery within Africa was different. A slave might be enslaved in order to pay off a debt or pay for a crime. Slaves in Africa lost the protection of their family and their place in society through enslavement.