Hey!!
A dominant trait means that there is more of something than the other, like say my traits are:
10% mean
60% nice
5% bored
25% hyper
my dominant trait is being nice. Another way to say it is by seeing how much of something is there, like for say fruit:
10 apple trees
20 grape vines
40 rassberry plants
15 pumpkin plants
There are more Rassberry plants than any other plant there soo, the dominant one is rassberrys.
Hope this helps!!