Only if your mutation is the same as the minor allele.
The minor allele in dbSNP, as the name suggests, only refers to the least frequently observed allele in the 1000 genomes project. If the allele of your mutation is not the same, then it's not comparable.
You need to look at the 1000 genomes project (http://www.1000genomes.org) or exome variant server (http://evs.gs.washington.edu/EVS/) to see the population-specific frequency of non-minor alleles.
All mutations are the samen as the minor allele. So, the MAF states the frequency as being heterozygous? In my results database I found the mutation in both heterozygous and homozygous form. Should I than count the amount of mut alleles and than see if its higher or lower?
You're confusing genotype with population allele frequency.
In a population, an allele (A, C, G or T) is observed at a certain frequency say 0.1 (or 10%). It has no relevance to genotype (AA, AC, CC, etc). Those observations can be a mixture homozygous or heterozygous genotypes. I haven't looked specifically, but I imagine that rare alleles are usually seen as hets.
If you want to compare your genotypes with the population genotype frequencies then the 1000 genomes and EVS have that information.
For an individual sample the genotype should only be hom or het and doesn't have a frequency - unless it is part of a large population-sized study.
Depending on your research question, a low MAF (e.g.
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