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There are four children in the Smith family. One child has blue eyes and blond hair. The other three children have brown eyes and blond hair. How can you explain this difference in eye color?
A) Brown eyes are the inherited trait; blue eyes are a mutation.
B) Eye color in an inherited trait; brown eyes are dominant over blue.
C) The brown eyed children have spent a lot of time outdoors; it's an environmental change.
D) The blue eyed child is younger than the children with brown eyes; their eyes will become brown.

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I believe it is B) because brown is a dominant trait 

The correct answer is (C)Eye color in an inherited trait; brown eyes are dominant over blue.

Eye color is an inherited trait in which brown colored eye (BB or Bb) is dominant over blue eyes (bb). Most of the population has brown eyes and there is a very less chance that an individual with blue colored eye is seen as it is a recessive trait. Both Smith (Bb) and his wife (Bb) will be carrier for the blue colored eye (bb). Then only it is possible that, one out of four child is having blue colored eye and rest three are having brown eye(BB or Bb).

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