Furi A cross was made between two strains of plants. One strain was herbicide se
ID: 149278 • Letter: F
Question
Furi A cross was made between two strains of plants. One strain was herbicide sensitive but disease resistant; thc othcr strain was herbicidc resistant but discasc sensitive. Both strains were purc- breeding. A plant breeder crossed the two strains, and then allowed the Fi generation to self- fertilize. The plants were then tested for their sensitivity to disease and herbicides. The following data were obtained: # of plants 164 58 53 18 Resistant to herbicide? Yes NO Resistant to disease? NO NO Yes es es NO Formulate a hypothcsis that you think is consistent with thc obscrved data. Test thc goodncss of fit between your hypothesis and the data using a chi square test. Explain what the chi square results mean. (Make sure that vou eventually come up with a hvpothesis that fits the data!Explanation / Answer
X^2 = .188
df = 3
.95 < p < .99 ---> p > .05
do not reject the null
Hypothesis: the alleles for disease sensitivity/ resistance and herbicide sensitivity/ resistance will sort independently of one another during gamete formation. As a result the progeny in the F2 generation will result in 4 phenotypic classes in a 9:3:3:1 Ratio
Null hypothesis: Any difference between the observed and expected results in the F2 generation is due entirely to chance alone.
Since the p value is greater than .05 we do not reject the null hypothesis
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