Say you are a white person who got a blood transfusion from a Native American. Could I now call myself part Native American??? After all I probably would have more Native American blood in me at that point than so called "Native Americans".
Or what if I got a skin graft from an asian man. Could I call myself part asian?
If no to either of those then what if I got a heart transplant from a black man? Would I not be part black?

This is probably really fucking stupid to ask but I am wondering this unironically.
What would it take for me to be allowed to change the "what race are you" boxes on a census?