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Brown eyes are dominant over blue eyes in humans The genetic makeup of blue-eyed children who have brown-eyed parents must be?
Wiki User
∙ 14y ago
B (dominant) is for brown and b (recessive) is for blue.
If both parents have brown eyes, for them to have a blue-eyed child their genotypes (the combination of b's) must both be Bb, because they both need to provide a little b (to have blue eyes you must be double recessive (bb)).
This is worked out using a Punnett Square. (example: https://mcglynn-bioreview4.wikispaces.com/file/view/basicpunnetsquare.jpg)
Wiki User
∙ 14y ago
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