It's entirely possible for a child to receive a completely different variation (like eye colour). When a child is conceived, they receive two of each gene, one from each parent. One gene is said to be dominant so if there are two different genes, the dominant will take the place. Brown eyes is a dominant gene, however, if the child were to receive two blue genes, then there would be no dominant gene (since they're the same) so the child would have blue eyes.
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