code: def add_suffixes_to_gene_codes(self):
          
          out = []
          for gene_code in self.data.gene_codes:
              for sufix in self.make_gene_code_suffixes():
                  out.append('{0}{1}'.format(gene_code, sufix))
          return out
docs: Appends pos1, pos2, etc to the gene_code if needed.