Abstract
1. The frequency of seed-color mutation of Rr: Cornell, which occurs at the rate of 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. The number of Rr:Cornell gametes tested for mutation in the F1 was sufficient to have yielded 22 mutations at the rate characteristic of the Cornell stock. 2. The backcross, F1 x Cornell stock, yielded 30 mutations (rate 9.2 x 10-4). The incidence of these mutations in relation to the segregation for the various marker genes indicates the presence of dominant genes favoring seed-color mutation of Rr:Cornell in the Y-marked segment and the J-marked segment of the tester stock. Similarly, the Rg-marked segment shows an effect unfavorable to the occurrence of the mutation. 3. The increase in mutation rate associated with the presence of the J segment appears to be highly significant statistically (P < .01). Since the statistical comparison assumes that sampling error due to individual plant variability is negligible, and since the results of the experiment as a whole indicate that plant variability may be very great, the evidence for the occurrence of this modifier is not considered conclusive. 4. The increase in mutation rate associated with the Y-segment was not quite significant in the backcross generation, but was clearly confirmed in the self-progeny of a backcross plant. The ratio of mutation rate in the y y vs. the Y y class was 1.0:2.3 in the backcross generation and 1.0:3.5 in the following generation. 5. The decrease in mutation rate associated with the Rg segment was significant in the backcross generation (P < .05) and was supported, in numbers inadequate for significance, in the second backcross generation. The location of a modifier in this segment is supported also by significant evidence of the same sort from a cross of Cornell with another stock. 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, and 4.4:1.0 in the backcross generation of the other cross mentioned. 6. The effect of the modifiers upon mutation frequency appears to be cumulative, so far as may be judged from the limited data.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
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.
- Treatment
- cross with a multiple linkage tester stocke0
- Outcome
- frequency of seed-color mutation of Rr: Cornelle0
- Direction
- reducede0
- Value
- 0e0
- Qualifier
- 18.2 x 10-4 in the Cornell stocke0
- Comparator
- Cornell stocke0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The frequency of seed-color mutation of Rr: Cornell, which occurs at the rate of 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”
t0“Maize”
Claim · model-written summary
The backcross of F1 to the Cornell stock yielded 30 mutations at a rate of 9.2 x 10-4.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The backcross, F1 x Cornell stock, yielded 30 mutations (rate 9.2 x 10-4)”
t0“Maize”
Claim · model-written summary
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.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicates the presence of dominant genes favoring seed-color mutation of Rr:Cornell in the Y-marked segment and the J-marked segment of the tester stock”
t0“Maize”
Claim · model-written summary
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.
- Gene
- J segmente0
- Outcome
- mutation ratee0
- Direction
- increasee0
- Qualifier
- the evidence for the occurrence of this modifier is not considered conclusivee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in mutation rate associated with the presence of the J segment appears to be highly significant statistically (P < .01)”
e1“the evidence for the occurrence of this modifier is not considered conclusive”
t0“Maize”
Claim · model-written summary
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.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in mutation rate associated with the Y-segment was not quite significant in the backcross generation”
e1“The ratio of mutation rate in the y y vs. the Y y class was 1.0:2.3 in the backcross generation and 1.0:3.5 in the following generation”
t0“Maize”
Claim · model-written summary
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.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in mutation rate associated with the Y-segment was not quite significant in the backcross generation, but was clearly confirmed in the self-progeny of a backcross plant”
e1“The ratio of mutation rate in the y y vs. the Y y class was 1.0:2.3 in the backcross generation and 1.0:3.5 in the following generation”
t0“Maize”
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.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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”
Claim · model-written summary
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.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The location of a modifier in this segment is supported also by significant evidence of the same sort from a cross of Cornell with another stock”
e1“4.4:1.0 in the backcross generation of the other cross mentioned”
t0“Maize”
Claim · model-written summary
The decrease in mutation rate associated with the Rg segment was supported, in numbers inadequate for significance, in the second backcross generation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in mutation rate associated with the Rg segment was significant in the backcross generation (P < .05) and was supported, in numbers inadequate for significance, in the second backcross generation”
t0“Maize”
Claim · model-written summary
The effect of the modifiers upon mutation frequency appears to be cumulative, judged from limited data.
- Outcome
- effect of the modifiers upon mutation frequencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of the modifiers upon mutation frequency appears to be cumulative”
t0“Maize”