Claim · model-written summary
The decrease in mutation rate associated with the Rg segment was significant in the backcross generation (P < .05), with a mutation rate ratio Rr Rr vs. Rr Rg of 3.5:1.0 in the cross with the linkage tester stock.
Zea maysNot reportedComparator
Verbatim
e0“The decrease in mutation rate associated with the Rg segment was significant in the backcross generation (P < .05)”
e1“The ratio of mutation rate in the Rr Rr vs. the Rr Rg class was 3.5:1.0 in the backcross generation of the cross with the linkage tester stock”
t0“Maize”
Title
Spontaneous Mutation at the R Locus in Maize. III. Genetic Modification of Mutation Rate
L. J. Stadler The American Naturalist 1949. doi:10.1086/281589
Other claims from this paper (9)
- Intervention effect The seed-color mutation frequency of Rr: Cornell, 18.2 x 10-4 in the Cornell stock, was reduced to 0 in the F1 of a cross with a multiple linkage tester stock.
- Observation The backcross of F1 to the Cornell stock yielded 30 mutations at a rate of 9.2 x 10-4.
- Mechanism Mutation incidence in relation to marker segregation indicates dominant genes favoring seed-color mutation of Rr:Cornell in the Y-marked and J-marked segments of the tester stock.
- Association The increase in mutation rate associated with the J segment appears highly significant (P < .01), but the authors do not consider the evidence for this modifier conclusive.
- Association The increase in mutation rate associated with the Y-segment was not quite significant in the backcross generation, where the ratio of mutation rate y y vs. Y y was 1.0:2.3.
- Association The increase in mutation rate associated with the Y-segment was clearly confirmed in the self-progeny of a backcross plant, with a y y vs. Y y ratio of 1.0:3.5 in the following generation.
- Association Significant evidence from a cross of Cornell with another stock supported a modifier in the Rg segment, with a mutation rate ratio of 4.4:1.0 in the backcross generation of that cross.
- Association The decrease in mutation rate associated with the Rg segment was supported, in numbers inadequate for significance, in the second backcross generation.
- Observation The effect of the modifiers upon mutation frequency appears to be cumulative, judged from limited data.