This question already has an answer here:

Do Muggle-borns in the Harry Potter universe produce magical children?

Specifically just to enumerate the situations:

  • If they marry a Pure-blood
  • If they marry another Muggle-born
  • If they marry a Muggle

What are the 'genetic rules' for heritability of magic in general?

marked as duplicate by Community Jun 21 '18 at 8:50

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    * cough * Harry Potter * cough *. – Shreedhar Jun 21 '18 at 8:33
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    From this answer: "Muggleborns will have a witch or wizard somewhere on their family tree, in some cases many, many generations back. The gene re-surfaces in some unexpected places." So having the gene so close to you in the family tree likely means that you're going to be a wizard. – Jenayah Jun 21 '18 at 8:34
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    Welcome to SFF! This is a nice first question (have my upvote). However, it would appear your question has been asked before, this is not a bad thing! Keep up the good questions! – TheLethalCarrot Jun 21 '18 at 8:45

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