It's basically simple math when talking about dominant/incomplete dominant genes. There are a few different ways to add to get to the number three, and any of the ways you do it is perfectly fine:
0+3=3
1+2=3
2+1=3
3+0=3
The same basic principle works in genetics, where each number you're adding together is equal to the number of genes in each parent snake (left side of equation=male, right side=female, total=offspring). Of course, in genetics, if you add (pair) any two numbers (snakes) where their sum (total combined genes) is greater than or equal to three, you could also end up with three (three genes).
Now, each of your animals only has one gene to bring to the table. You can't combine any of them together in one shot to end up with a three gene offspring.
Like WmHrbst already said - recessive genetics are a little different story, but they still follow the same basic math principle at the ground level.










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