Responses
No. Betas are the most common. Alphas are only slightly less rare than Omegas in general.
And since there are dominant and recessive Alphas (, Betas?) and Omegas this explanation doesn't fit either. There are recessive and dominant genes and some genes only need one allele to be dominant in order to make the gene itself dominant whereas others need both to be either, accordingly. That certainly seems to be the more likely explanation.
I should think it was like blood types; with type A (alpha) or type B (beta) both being dominant types, but type O (omega) being recessive. Otherwise it is kind of hard genetically to explain how you can have so few omegas compared to alphas and betas. But oh well...