Selection through the Choice of Seeds from Dominant Plants of an Allogamous Population.

Consider the problem of selection involved in choosing seeds from plants showing a certain dominant character, while no effort is made to influence the source of pollen. In the following discussion the fate of a single Mendelian character will be studied under such mating. The conclusion can be stated thus: The limiting population resulting from the type of mating in question i s all of one class, pure dominants. It is interesting to contrast this conclusion with the fact, repeatedly pointed out in recent years, that in unrestricted random mating the proportions of pure dominants, heterozygotes and recessives are fixed after a single operation of random mating.