digraph G {
size="10,10";  ratio = fill;
node [shape=square,width=1.5];
Geno1 -> Trait2;
Geno2 -> Trait3;
Geno2 -> Trait4;
Geno2 -> Trait6;
Trait2 -> Trait1;
Trait2 -> Trait4;
Trait3 -> Trait4;
}