. Plant genetics . Heredity; Mendel's law; Plant breeding. 42 Plant Genetics investigators, however, claim that it cannot be applied to all the situations that have been discovered. This hypothesis introduces some additional termi- nology suggested by Bateson. In our illustration the tall parent has two determiners for tallness and therefore Bateson calls it duplex, having a double dose. For the same reason the Fi individuals, having only one deter- miner for tallness, he calls simplex. According to the WIS o o Tall Punt —>. F, Hybrid Dwarf Puent Gametes Fig. 6.—Diagram showing how the orig
. Plant genetics . Heredity; Mendel's law; Plant breeding. 42 Plant Genetics investigators, however, claim that it cannot be applied to all the situations that have been discovered. This hypothesis introduces some additional termi- nology suggested by Bateson. In our illustration the tall parent has two determiners for tallness and therefore Bateson calls it duplex, having a double dose. For the same reason the Fi individuals, having only one deter- miner for tallness, he calls simplex. According to the WIS o o Tall Punt —>. F, Hybrid Dwarf Puent Gametes Fig. 6.—Diagram showing how the original scheme must be modi- fied to satisfy the presence and absence hypothesis. same terminology the dwarf parent is nulliplex with respect to its character of tallness. Additional advantages of the presence and absence hypothesis will appear in connection with a considera- tion of blending inheritance and of cumulative factors in inheritance. Attention, however, should be called to the fact that those who accept the presence and ab- sence hypothesis do not use the form of notation thus far used in explaining Mendelian inheritance. Assume that T is used to express the determiner for tallness, the same letter (t) is used to express its absence. For example, instead of using D for dwarfness, t is used for "lack. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928; Coulter, Merle C. (Merle Crowe), 1894-1958. Chicago : The University of Chicago Press
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