Question

Arabidopsis thaliana is a green-leafed plant, but a variegated type has green-and-yellow leaves. STATE: To investigate the mechanism of plant variegation, researchers created a recessive mutation that suppresses variegation in the DNA of the variegated Arabidopsis. Are the data consistent with a single recessive mutation with 3 : 1 ratio of variegated to green plants? PLAN: When the green mutants were crossed with the variegated types, the first-generation plants were all variegated, thus confirming the recessive aspect of the mutation. The second generation consisted of 84 green plants and 216 variegated plants. SOLVE: Use a chi-square test to answer the questions. With the exception of the second question, which requires an integer value, enter your answers rounded to two decimal places. ?² = df = Use Table D to find the P-value from the chi-square statistic and the degrees of freedom. (Enter your answer rounded to two decimal places.) P-value = CONCLUDE: What is your conclusion from the data? Select the correct conclusion. O There is a lot of evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model. O None of the options are correct. O There is not enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. O There barely enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model.

Arabidopsis thaliana is a green-leafed plant, but a variegated type has green-and-yellow leaves.

STATE: To investigate the mechanism of plant variegation, researchers created a recessive mutation that suppresses variegation in the DNA of the variegated Arabidopsis. Are the data consistent with a single recessive mutation with 3 : 1 ratio of variegated to green plants?

PLAN: When the green mutants were crossed with the variegated types, the first-generation plants were all variegated, thus confirming the recessive aspect of the mutation. The second generation consisted of 84 green plants and 216 variegated plants.

SOLVE: Use a chi-square test to answer the questions. With the exception of the second question, which requires an integer value, enter your answers rounded to two decimal places.

?² =

df =

Use Table D to find the P-value from the chi-square statistic and the degrees of freedom. (Enter your answer rounded to two decimal places.)

P-value =

CONCLUDE: What is your conclusion from the data? Select the correct conclusion.

O There is a lot of evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model.
O None of the options are correct.
O There is not enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration.
O There barely enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model.

Arabidopsis thaliana is a green-leafed plant, but a variegated type has green-and-yellow leaves.

STATE: To investigate the mechanism of plant variegation, researchers created a recessive mutation that suppresses variegation in the DNA of the variegated Arabidopsis. Are the data consistent with a single recessive mutation with 3 : 1 ratio of variegated to green plants?

PLAN: When the green mutants were crossed with the variegated types, the first-generation plants were all variegated, thus confirming the recessive aspect of the mutation. The second generation consisted of 84 green plants and 216 variegated plants.

SOLVE: Use a chi-square test to answer the questions. With the exception of the second question, which requires an integer value, enter your answers rounded to two decimal places.

?² =

df =

Use Table D to find the P-value from the chi-square statistic and the degrees of freedom. (Enter your answer rounded to two decimal places.)

P-value =

CONCLUDE: What is your conclusion from the data? Select the correct conclusion.

O There is a lot of evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model.
O None of the options are correct.
O There is not enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration.
O There barely enough evidence to conclude that the F2 distribution does not follow a 3 : 1 ration. The data are consistent with a single recessive mutation model.

Added by Meghan W.

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