Inheritance of Resistance to Bacterial Infection in Animals a Genetic Study of
Inheritance of Resistance to Bacterial Infection in Animals a Genetic Study of
Elmer Roberts
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generation produced by crossing resistant and susceptible stock was as resistant as the resistant parents. 4. Progeny of the F x individuals mated to resistant were signif- icantly more resistant than were the progeny of the back-cross to susceptible. 5. In the F 2 generation susceptible and resistant strains were recovered by selection. 6. A susceptible male mated to susceptible females produced progeny which were much less resistant than were progeny of the same male mated to resistant female...s. 7. No significant difference was found between the progeny of susceptible and resistant females mated to the same resistant male. 8. Acquired immunity was not present in the experimental birds, the progeny of infected hens exhibiting no greater resistance to dis- ease than the progeny of noninfected hens, infection and freedom from infection being determined by the agglutination test. 9. Resistance is dominant to susceptibility, but probably more than one gene is involved. 10. In an examination of the blood of noninoculated young chicks the number of erythrocytes was found to be greater in the resistant (6 out of 7 cases) than in the susceptible strain.
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