. Biology in America. Biology. 258 Biology in America luodilird by oilier trails) in the make-up of the organism. The basis of this persistence we liave already seen to bo the chromosome. In those cases in which one character domi- nates anotlier (tallness vs. dwarfness in peas, color vs. al- binism in animals, etc.), we have the phenomenon known as latency, in which the determiner of a character may be passed along for several generations, without the character itself coming to expression. In such cases the character is definite and the individual is distinct in respect to its pos- session. T
. Biology in America. Biology. 258 Biology in America luodilird by oilier trails) in the make-up of the organism. The basis of this persistence we liave already seen to bo the chromosome. In those cases in which one character domi- nates anotlier (tallness vs. dwarfness in peas, color vs. al- binism in animals, etc.), we have the phenomenon known as latency, in which the determiner of a character may be passed along for several generations, without the character itself coming to expression. In such cases the character is definite and the individual is distinct in respect to its pos- session. There is no uncertainty for example, as to whether. InHEKITANCE of COLOIi IN THE FoUR O'CLOCK F], Fo, first and second generations. From Morgan, Stiirtcvtint, Mul- ler and Bridges, "Mechanism of Mendclian ; By permission of J. B. Lippincott Company. a guinea pig is spotted or uniform in color, or a man's liair is curly or straight. There are cases however in which the organism is neither "fish, flesh, nor good red herring," or speaking scientifically dominance is imperfect or incomplete. The four o'clock (INlirabilis jalapa) has a white- and a red- flowered race, which when crossed produce plants with pink flowers. When these pink-fiowered plants however are bred inter se they produce 1 red to 2 pink to 1 white offspring, the firet and last classes of which breed true, while the mid- dle class when inbred continues to "throw" red, white and pink plants in the above ratio. A crude chemical analogy to these phenomena may be made in the following way: At. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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