M_BH − M_* ratio as a function of redshift. The top panel shows the values for the total AGN sample. The bottom panel shows the results when we accounted for selection biases (see text for more details). The horizontal dashed black line in both panels indicates the mean M_BH − M_* ratio value of our dataset. The horizontal long-dashed green line presents the mean M_BH − M_* ratio value, when selection biases are taken into consideration.