code: def get_acgt_geno_marker(self, marker):
          
          # Getting the marker's genotypes
          geno, snp_position = self.get_geno_marker(marker, return_index=True)
  
          # Returning the ACGT's format of the genotypes
          return self._allele_encoding[snp_position][geno]
docs: Gets the genotypes for a given marker (ACGT format).
  
          Args:
              marker (str): The name of the marker.
  
          Returns:
              numpy.ndarray: The genotypes of the marker (ACGT format).