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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):






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.