. The physical basis of heredity . Heredity. MENDEL'S FIEST LAW 35 Marshall and Muller kept flies heterozygous for three re- cessive mutant factor for about seventy-five generations, and at the end of that time found that these factors had not been weakened in any way as a result of juxtaposition. Fig. 13,—Notch wings in the vinegar fly, extreme condition, o; average condition, b; nearly normal condition, c. with their normal dominant allelomorphs. I have kept a stock of notch-winged flies under selection for twenty- five generations. Notch (Fig. 13) is a character varying in the direction of
. The physical basis of heredity . Heredity. MENDEL'S FIEST LAW 35 Marshall and Muller kept flies heterozygous for three re- cessive mutant factor for about seventy-five generations, and at the end of that time found that these factors had not been weakened in any way as a result of juxtaposition. Fig. 13,—Notch wings in the vinegar fly, extreme condition, o; average condition, b; nearly normal condition, c. with their normal dominant allelomorphs. I have kept a stock of notch-winged flies under selection for twenty- five generations. Notch (Fig. 13) is a character varying in the direction of normal wings (Fig. 13, c); in every generation of notch, many notch flies have normal wings. The character is dominant, and exists only in heterozy-. 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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