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Silvia has blond hair, even though her mother and father each have brown hair. what do we know about silvia's parents? at least one of her parents has a recessive gene for blond hair. each of her parents must have one recessive gene for blond hair color. each of her parents must have one dominant gene for blond hair. neither of her parents has a gene for blond hair.

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joelpimentel
Each of her parents must have one recessive gene for blond hair color :)

The correct answer is that each of her parents must have one recessive gene for blond hair color.

The gene for blond hair is recessive, thus, both the parents must exhibit one recessive gene so that Silvia can have blond hair. Blond hair refers to the color of the hair, which is featured by diminished concentrations of the dark pigment eumelanin.