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Genetic control of resistance of chick embryo cultures to RSV (RAV 50).

The genetic control of resistance of chick embryo cultures to RSV (RAV 50) was studied in crosses between the highly inbred Reaseheath lines, I, C and W and in the test-cross between WC(F1) and RPRL line 7. Embryo cultures resistant to RSV(RAV2) were also resistant to RSV(RAV 50). Genetic analysis of the segregation results of resistance and susceptibility in the F2, back-crosses, and test-cross populations suggests that the tvb genes pleiotropically control the resistance of the embryo cultures to RSV(RAV 50).