This is a simple question but I couldn't find any information on it.
I am preparing to do a linkage map and I am going through the map
construction tutorial (which is great!). However, the tutorial has
only one family and I will have ~20 F2 families. I will also have
genotypes of the parents which I would like to put in there. How
should I code it in the csv file so that R/qtl reads it correctly?