BURST OF EVOLUTION. “The presence of genes for male characters on the Y, but not the X, also indirectly suggests that antagonistic selection must have acted. When there has been a recent transposition of an autosomal gene onto the Y chromosome, if sufficient intraspecies variability is available, tests for selection based on comparisons of polymorphism and divergence could be used to ask whether the locus has experienced a burst of adaptive evolution.”
http://www.nature.com/hdy/journal/v95/n2/full/6800697a.html