So far, different statistics have been established to detect different kinds of selection signatures, for instance, extended haplotype homozygosity (EHH; Sabeti et al. 2002) for recent selection and Tajimas DD (Tajima 1989) for relatively ancient selection.
Despite the possibility for similar kinds of selection in the two breeding systems, upon inbreeding, reduced effective recombination with selfing could have resulted in higher (haplotype) diversity because of selection on overdominant loci (Navarro and Barton, 2002).
While the contents of sensory-perceptual representations might be determined by the functions that derive from natural selection operating over an evolutionary span of time, the role of learning in concept acquisition suggests that other kinds of functions that derive from other kinds of selection might be needed for the contents of learned concepts.
The negative Tajima D value might indicate such kind of selection for BLZ2 in the two-rowed subset caused by the elimination of deleterious alleles and leaving only one major haplotype which is common to 95 of the 108 two-rowed accessions.
It would be useful to study other kinds of evidence for selection acting on males, such as production of pheromones by hermaphrodites [ 80- 82], or production of substances by the males that induce immobilization of hermaphrodites during copulation [ 68].
This family encompasses various kinds of selection rules, all specifically designed for a given parameter.
As Ayelet Shavit and Roberta Millstein ably point out, this debate is bound for nowhere without tight enough definitions of these kinds of selection.
That as we get over that hump and somewhere on the down slope in the use of resources, there will come a time in which the creatureliness of these plants, these perennial grain crops, are available for the same kind of selection that farmers have had for millennia, and agronomists for hundreds of years.
This creates two kinds of selection bias.
This requires the capacity to produce the right kind of variation for selection to act upon.
