def get_acgt_geno_marker(self, marker):
        """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).

        """
        # 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]