If one parent has brown eyes and it is dominant color over the blue eyes the other has what genotype must they both be to ensure that all kids have blue eyes. I need the answer as soon as possible

For example, if the blue-eyed parent passed down a blue allele, and the brown-eyed parent passed down a brown allele, the child's genotype will be blue-brown, and his or her phenotype will be brown. How do we know that the child's eyes will be brown?

Explanation:

because the light is a great source of energy for the plants to survive. (i hope this )