In humans, assume that brown eyes is dominant and blue eyes is recessive. If two brown-eyed individuals have a child with blue eyes, that means:
a. both parents are homozygous for brown eyes.
b. both parents are heterozygous for eye color.
c. there is a 1/4 chance that their second child will have brown eyes.
d. there is a 50/50 chance that their second child will have blue eyes.
e. None of the above.
Answer: b. both parents are heterozygous for eye color.
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