. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EFFECTS OF INBREEDHsTG AND CROSSBREEDING. 45 heterozygosis will remain true indefinitely. Summing up, a random- bred stock derived from n inbred families will have th less superiority over its inbred ancestry than the first cross or a random-bred stock from which the inbred families might have been derived without selection. COMPARISON OF RESULTS WITH THEORY. In the foregoing theoretical considerations we have assumed that the characteristics depend on the heredity of the progeny produced by the mating in question. It
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EFFECTS OF INBREEDHsTG AND CROSSBREEDING. 45 heterozygosis will remain true indefinitely. Summing up, a random- bred stock derived from n inbred families will have th less superiority over its inbred ancestry than the first cross or a random-bred stock from which the inbred families might have been derived without selection. COMPARISON OF RESULTS WITH THEORY. In the foregoing theoretical considerations we have assumed that the characteristics depend on the heredity of the progeny produced by the mating in question. It will be recalled, however, that we found good reason for beheving that most of the characteristics in the experiments with guinea pigs were really determined wholly or in part by the parents, in most cases the dam, as far as these character- istics were genetic at all. In a character determined wholly by the dam. Experiments CO and CA belong with the inbreds, CC, AC, and Cl represent the first cross, and C2 represents the first generation of. Fig. 26.—The percentage of heterozygosis following matings among inbred families of the types PQ x RS PQ X QR, and PQ x PQ. Original families, x of type AA and y of type aa. renewed inbreedmg. In characters determined partly by the parents and partly by the progeny we can easily find the relations which are to be expected by combining the expectations based on the breeding of the dam and sire with those based on the progeny. Table 13 shows the expectation in certain cases, while Figure 27 presents some of the same conclusions 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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