Given markers (or more correctly dominant 1,0) marker data and return list object of containing markers data split according to parental alleles, namely 1,0 for each parent and 1,1 for both parents
markers: matrix of 1, 0, NA indicating marker alleles where rownames are markernames, column names are progeny names
description: text containing a description for printing
parent.cols: column(s) for parental markers (default: 1,2)
extra.cols: extra column(s) to be subsetted (default: NULL)
cols.drop: columns to be dropped from markers before splitting data which can be set to NULL if no columns are to be dropped (Default: c(parent.cols,extra.cols))
Returns
Returns S3 class divideAutoMarkers containing - p10, p01, p11: lists for where the first, second components are heterozygous for parents 1, 2 and both resp. Each list contains
* `description`text containing a description for printing
* `parent`label for parent
* `markers`markers for specified parental type (including parents etc)
* `extras`extra columns subsetted (if specified)
* `seg.ratios`segregation ratios as class `segRatio`