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The Theory of Presence and Absence.—Many, if not all, allelomorphs consist of the presence and absence respectively of a given determiner.

The factor for this eye color is another allelomorph of white.

Multiple allelomorphs, that is, a series of different grades of a single factor.

An albino is a homozygote; that is, all its gametes are carrying the character of albinism and none of them bear the alternative character —the allelomorph—-of pigmentation.

The meaning of this is that we may get various combinations of characters not associated in the original pure stocks, the number of such combinations depending on the number of pairs of allelomorphs there are.