. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 322 ELEMENTS OF BIOLOGY breed Tall through succeeding generations. Therefore, one-fourth of the F2 generation were pure for the character of Tallness, as one-fourth had been shown pure for Dwarfness. The remaining half, when bred, behaved like the Fi generation, separating out in the F3 generation as Tall and Dwarf in the proportion of 3:1. The Dwarfs of the F3 generation again proved to be pure and the re- PA RENTS TT—^TT Tt—t-Tt TT Tt Tt Tt Tt TT TT TT TT TT TT TT Tt—tzTt TT Tt Tt tt TT. TT
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 322 ELEMENTS OF BIOLOGY breed Tall through succeeding generations. Therefore, one-fourth of the F2 generation were pure for the character of Tallness, as one-fourth had been shown pure for Dwarfness. The remaining half, when bred, behaved like the Fi generation, separating out in the F3 generation as Tall and Dwarf in the proportion of 3:1. The Dwarfs of the F3 generation again proved to be pure and the re- PA RENTS TT—^TT Tt—t-Tt TT Tt Tt Tt Tt TT TT TT TT TT TT TT Tt—tzTt TT Tt Tt tt TT. TT Tt T'T"—r—jr TT TT TT TT Fig. 204.—Chart showing the behavior of Tallness (T) and Dwarfness (t) in a monohybrid cross in peas. maining three-fourths of the F3 generation that were Tall again proved to be of two sorts, Tall, and Tall with the potential of throwing Dwarf offspring. Mendel's Laws. We now may analyze a monohybrid cross: The Fi generation are all Tall. To outward appearance the F2 generation is in the proportion of three Tall to one Dwarf; in po- tential for characters in future offspring, the ratio is one Tall : two Tall with Dwarf hidden : one Dwarf. By this experiment with. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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