1. A blue-eyed boy was born in a family where both parents are brown-eyed. What kind of variability manifested itself in this case? Explain all the possible mechanisms of such variability.
The only way to present blue eyes is to inherit two copies of the blue-eyed gene. However, brown-eyed parents can pass a recessive blue-eyed gene. Therefore, two brown-eyed partners can birth a blue-eyed baby. Brown eyes + blue eyes = 50% chance of blue eyes, but only if the brown-eyed parent carries a blue-eyed gene.
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