Black eyes are 'dominant' over blue eyes because the black color is due

to a pigment, while the blue color is due to the absence of this
pigment
Black eyes are 'dominant' over blue eyes because the black color is due
to a pigment, while the blue color is due to the absence of this
pigment. In general a quality which is due to the presence of some
positive element is dominant over a quality due to the absence of that
element. A child inheriting from a blue-eyed person simply draws a blank
from that side in the lottery.