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21 October, 03:28

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. At least one of her parents has a messenger gene for blond hair. Neither of her parents has a gene for blond hair.

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  1. 21 October, 03:31
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    Each of her parents must have one recessive gene for blond hair color

    Explanation:

    Blond is a recessive trait Since Silvia is blond this means she has both copies of the recessive gene for hair color Therefore, both her parents have a recessive gene for blond hair and passed it down to her. The parents don't have blond hair because their dominant gene for browns masks the recessive gene for blond.
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