If you get a bone marrow transplant, your blood can have the donor's DNA

Have you ever donated blood and wondered if the person you are donating to will end up with your DNA? This is actually not the case. When you donate blood, you donate packed red blood cells, which do not change another person's DNA.

However, this is not the case with bone marrow transplants. When someone receives a bone marrow transplant they, they also receive cells called hematocytoblasts. These cells sometimes develop into rubriblasts, which then turn into red blood cells. This transplant also let's them produce white blood cells and platelets. Hence, when someone receives a bone marrow transplant, they also receive the building blocks to make blood.

This is troublesome when it comes to using DNA samples as evidence in a crime scene. Usually, DNA at a crime scene is from blood. Hence, that blood could be associated with one person but belongs to someone else. Of course, you can still identify a person's true DNA if you are willing to wait a bit. Experts can identify isoenzymes in the blood of those who have received a transfusion. As such, they can identify the individual's true DNA.

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