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Delete unwanted variables

When the barley mapping data is displayed in a biplot, it looks like:

Note that it is based on tester-standard deviation standardized data so that the units of the traits are removed.

Suppose one wants to identify QTL for kernel weight (KW):

• Under the main menu of Data Manipulation, click Run any subset by ... and select Deleting any testers. A form with two text list boxes will appear, which allows moving the testers between the two boxed freely. Now move all traits other than KW in the box "To Remove":

• Click OK, the a biplot will appear, which contains only the markers plus KW:

In depth: Why double-haploid "31" stands out from other double-haploids because this genotype has a value of '0'  for all markers on chromosome 6, which are located on the other side of the biplot origin.