. The physical basis of heredity . Heredity. Fia. 10.—Relation of tall to short peas as shown by F2 classes. group: Here the taU and the heterozygous group are alike, and inseparable by ordinary inspection, even at the extreme end of their variation curves, and short is "completely" recessive. In cases in which the environment enters more obviously into the result (as in " abnormal abdomen,'' Fig. 5), the following scheme (Fig. 11) represents the relation:. Fia. 11.—Relation of normal to abnormal abdomen as shown by classes of Fi flies, signifies conditions that make for normal;

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. The physical basis of heredity . Heredity. Fia. 10.—Relation of tall to short peas as shown by F2 classes. group: Here the taU and the heterozygous group are alike, and inseparable by ordinary inspection, even at the extreme end of their variation curves, and short is "completely" recessive. In cases in which the environment enters more obviously into the result (as in " abnormal abdomen,'' Fig. 5), the following scheme (Fig. 11) represents the relation:. Fia. 11.—Relation of normal to abnormal abdomen as shown by classes of Fi flies, signifies conditions that make for normal; wet for abnormal. "Dry" In this case both the heterozygous and the parental "abnormal" type may show "normal" abdomen like the. 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 Morgan, Thomas Hunt, 1866-1945. Philadelphia : Lippincott

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