Why dominant traits may not necssairly be more common in a population

This isn't always the case and there is no reason it should be .Whether or not a trait is common has to do with how many copies of that gene version (or allele) are in the population. It has little or nothing to do with whether the trait is dominant or recessive. Let's take eye color as an example.

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I hope this answer helps: The nitrogen bases pair up in twos: cytosine with guanine and adenine with thymine. 
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