Minor Allele Frequency at Marker Locus Use this text box to specify the frequency of the minor allele at the Marker locus. The value entered must be between 0.0 and 1.0. A frequency of 0.05 is specified by default. Note: This parameter is not available unless the Marker locus is disease locus box is unchecked. To Specify the Minor Allele Frequency: Make sure that the Marker locus is disease locus box is unchecked. Type the minor allele frequency value in the text box.