Well you do get hets... its just that some hets show that they are het (Fires, Pastels, Cinnamons, etc), others will hide it (Albinos, Hypos, Pieds, etc).
That's the difference between Co-Doms and Doms (Fires, Pastels, Cinnamons, etc / Pinstripe, Spider, etc) and Recessives (albinos, Hypos, Pieds, etc).
Now the difference between Co-Doms and Doms is that when a Co-Dom has 2 genes telling it to have that trait it will look different (usually referred to as a Super (Fires/Black Eyed Leucistics, Pastels/Super Pastels, Yellow Belly/Ivory, etc) while a Dom can have 2 of the gene telling it to be Dom and it will look no different from if it had 1 gene telling it to be Dom (Spiders and Pinstripes).
Biology class usually covers this, but a lot of people don't pay attention/don't remember/never take the class, lol. But here is a nice article that will cover the basics for you
http://www.ball-pythons.net/forums/s...ad.php?t=52847
As for the last persons post:
Only one sperm cell can enter a single ovum.
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