This parameter is optional . Ratios should be entered only when the ratios that you expect differ from the following default ratios.
Type the values in a space delimited list, which represents the expected segregation ratios for the chosen experimental cross, in the text box.For example, in an F2 population the expected ratios of 0.25 : 0.50 : 0.25 should be entered as shown below:Note : Values are delimited by a single space with no punctuation.