Estimate locations of crossovers
Estimate the locations of crossovers for each individual on a given chromosome.
locateXO(cross, chr, full.info=FALSE)
cross |
An object of class |
chr |
Chromosome to investigate (if unspecified, the first chromosome is considered). This should be a character string referring to a chromosome by name; numeric values are converted to strings. |
full.info |
If TRUE, output will include information on the left and right endpoints of the intervals to which recombination events are known, as well as the corresponding marker indices. |
For each individual we detemine the locations of obligate crossovers, and estimate their location to be at the midpoint between the nearest flanking typed markers.
The function currently only works for a backcross, intercross, or recombinant inbred line.
A list with one component per individual. Each component is either NULL or is a numeric vector with the estimated crossover locations.
If full.info=TRUE, in place of a numeric vector with estimated
locations, there is a matrix that includes those locations, the left
and right endpoints of the intervals to which crossovers can be
placed, the marker indices corresponding to those endpoint, and
genotype codes for the genotypes to the left and right of each crossover. The
final column indicates the number of typed markers between the current
crossover and the next one (useful for identifying potential
genotyping errors).
Karl W Broman, broman@wisc.edu
data(hyper) xoloc <- locateXO(hyper, chr=4) table(sapply(xoloc, length))
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