code: def addTaxon(self, taxon_id, genopart_id):
          
          self.graph.addTriple(
              genopart_id, self.globaltt['in taxon'], taxon_id)
  
          return
docs: The supplied geno part will have the specified taxon added with
          RO:in_taxon relation.
          Generally the taxon is associated with a genomic_background,
          but could be added to any genotype part (including a gene,
          regulatory element, or sequence alteration).
          :param taxon_id:
          :param genopart_id:
  
          :return: