Perfect! This is what we saw with the red and the blue balls that had a 50% chance. The box was eventually filled with both red and blue balls.
Now, consider left- and right-handed humans. Handedness is a trait, the way red and blue colours were a trait.
Assuming humans have interacted long enough, do you think the 'dominance' model explains the percentage of people who are right- and left-handed in the world?