2 years, 5 months ago
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Is it possible for parents with brown eyes to have a child with blue eyes. Paternal grandfather,maternal grandmother has blue eyes. What %
What percent of that child to have blue eyes with both parents having brown eye?
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Genes for brown eyes are dominant over blue. If each brown-eyed parent has one blue-eyed parent then they carry one gene for brown eyes and one for blue. The child will get either a brown or blue from each parent, in four possible combinations:
Mom-blue, dad-blue = blue-eyed child
mom-brown, dad-blue = brown eyed child
mom-blue, dad-brown = brown eyed child
mom-brown, dad, brown = brown-eyed child
So you can see the odds of brown-eyed parents who each carry a recessive blue-eyed gene having a blue-eyed child is 25%, and the chances of having a brown-eyed child are 75%.
Mom-blue, dad-blue = blue-eyed child
mom-brown, dad-blue = brown eyed child
mom-blue, dad-brown = brown eyed child
mom-brown, dad, brown = brown-eyed child
So you can see the odds of brown-eyed parents who each carry a recessive blue-eyed gene having a blue-eyed child is 25%, and the chances of having a brown-eyed child are 75%.
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