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Harry Potter Wiki

These genes were portions of human DNA that determined whether an individual would have magical abilities. Those people born with the genes active were witches and wizards, while those who were not were Muggles or Squibs.[1][2]


Magic genes were described as being "dominant and resilient".[1] Squibs, while unable to use magic, were often still able to function within the wizarding world to a limited degree. The descendants of squibs who instead integrated into the Muggle world and married would usually be Muggles, although the magical abilities occasionally resurfaced in later generations, producing a Muggle-born witch or wizard.[2]

Behind the scenes

  • According to J. K. Rowling, nobody knows where magic comes from.[3] Therefore, it is unknown whether or not the ability to use magic is solely biological, stemming from unknown biological processes, or if magic is an external force that wizards are merely genetically predisposed to connect with.
  • Since Voldemorts ability to use magic survived with his soul, it can be assumed that magical ability has a connection to the soul. Further evidence would be Harry Potter's ability to speak Parseltongue while being a horcrux.
  • J. K. Rowling stated that she had considered having Dudley Dursley have a magical child in the epilogue, and see them off to Hogwarts at Platform 9¾ at the same time as Harry and his family. She decided against this, however, stating that any latent wizarding genes would never survive contact with Uncle Vernon's DNA.[4] The Dursleys are most likely homozygous Muggles for the reasons mentioned above, although if this is true, the impossibility of having a magical descendant would be determined by both Vernon and Petunia instead of solely because of Vernon.


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Notes and references