Fantastic Beasts 3: How Jacob Can Become A Wizard - Theory Explained
Jacob Kowalski (Dan Fogler) can learn to harness his buried magical skills in Fantastic Beasts: The Secrets of Dumbledore. The Fantastic Beasts 3 trailer shows Newt (Eddie Redmayne) handing a wand to Jacob as a gift from Dumbledore (Jude Law), even though Jacob is knowingly a Muggle, and the Harry Potter series has often explained how non-wizards can't practice magic. But according to J.K. Rowling, magic is much like any other talent, hence one can be born with it, or can discover and develop it later in life. This leaves a door open for Fantastic Beasts' No-Maj Jacob.
In Fantastic Beasts And Where To Find Them, Newt pairs up with Jacob entirely by accident, as the two swap suitcases in New York. This gets Newt taken into MACUSA by Tina (Katherine Waterston) and Jacob bitten by a Murtlap. Eventually, Newt and Tina find Jacob, and Newt invites him into his magical suitcase, where he offers him treatment for the Murtlap bite. Newt also comments that Jacob seems to be having a more severe reaction to the bite, as Muggle DNA is slightly different from the wizard one. This connects to something J.K. Rowling said about wizard genes.
Related: JK Rowling Already Hinted At Queenie & Jacob's Fantastic Beasts Ending
J.K. Rowling stated on her website: "Squibs are rare; magic is a dominant and resilient gene." This confirms that wizard DNA is slightly different from Muggle one, but also that there must be recessive wizard genes in many Muggles (which explains why Muggle parents can have wizard children and vice versa). Jacob might have recessive wizard genes from further up the family tree, unbeknownst to him or his parents. If magic is like a talent (and can thus be discovered and perfected later in life), it's likely there is
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