: why does blood transfer not change someone’s DNA?
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1. DNA is a feature of nearly every single cell of your body. Nucleus of every single cell has the exact copy of your genome within it, it’s just an inherit part of the cell that the entire cell is build around, so inserting a bunch of cells from a different body won’t suddenly shift the DNA in other completely unrelated tissues.
2. Neither can they overtake the body by numbers, cells in normal circumstances are specialized and they don’t shift between different tissues. Blood is a tissue too, and one that doesn’t even replicate – it’s created in bone marrow and after entering the bloodstream it’s already destined to die.
3.Also, blood doesn’t have much of DNA to begin with. Red blood cells are technically dead, they lack the nucleus and any metabolism that comes with it, same for platelets. Only white blood cells have any DNA in them, but majority of them dies in a short time after the transfer or is killed by your body’s white blood cells.
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