Inheriting the magical blood down the line, via a wizard father or a witch mother is understandable in case of Half-Bloods.
I am wondering as to how Muggle-borns end up with magical ability?
Answer
The best theory I can suggest is that magical ability is like a recessive gene. If each Muggle parent is a carrier, they can produce a magical child. (However, this theory only works if you exclude Squibs :P)
Also, quoting JK Rowling:
"Muggle-borns will have a witch or wizard somewhere on their family tree, in some cases many, many generations back. The gene resurfaces in some unexpected places."
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