What happens is it alters the regulation of the expression of the gene. Sometime you will see a loss of function, or reduction of ability to work such as complete loss of a protien code. Or you can gain a function or to much. So it doesn't regulate what it needs well and keeps producing when it shouldn't.
1.they have slime molds.
2.they also have have water molds.
The difference in air pressure.
The answer with the 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of different sizes and the same type