"Now," Fleur continued from where Hermione had left off so seamlessly that the group wondered if they had rehearsed this," Gene C is a genetic mutation caused by too much inbreeding. Hence, Squibs are born. Now, gene C is dominant to genes A and B. But, toge'zzer," Fleur made a mark on Hermione's parchment," Zey cause a child to become AA again meaning...?"