QUESTION 9 From Case Study 2_Drosophila, which of the following statements best

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QUESTION 9

From Case Study 2_Drosophila, which of the following statements best expresses the null hypothesis for this experiment. [2 pt; L2; I.A.1]

The two genes are linked and, therefore, assort independently.

The two genes are not linked and, therefore, assort independently.

The two genes are linked and, therefore, do not assort independently.

The two genes are not linked and, therefore, do not assort independently.

2 points

QUESTION 10

From Case Study 2_Drosophila, which of the following statements best expresses the alternative hypothesis for this experiment. [2 pt; L2; I.A.1]

The two genes are not linked and, therefore, do not assort independently.

The two genes are linked and, therefore, do not assort independently.

The two genes are not linked and, therefore, assort independently.

The two genes are linked and, therefore, assort independently.

2 points

QUESTION 11

According to Mendelian inheritance, what is the expected ratio for the four phenotypes? [2 pt; L2; I.A.3]

1:1:1:1

1:3:3:1

3:2:2:1

9:3:3:1

2 points

QUESTION 12

What statistical test is most appropriate for an analysis these data (Case Study 2_Drosophila)? [2 pt; L2; I.A.3]

chi-squared test

t-test, 1-tailed

t-test, 2-tailed

ranks test

2 points

QUESTION 13

What is the probability of obtaining the numbers posted under the null hypothesis (Case Study 2_Drosophila)? To receive credit, report the p value correctly rounded to 4 decimal places. [2 pt; L2; I.A.3]

2 points

QUESTION 14

Based on the results of the statistical test, do you reject or fail to reject the null hypothesis (Case Study 2_Drosophila)? [2 pt; L2; I.A.3]

fail to reject

reject

2 points

QUESTION 15

Which of the following best expresses the conclusion drawn from Case Study 2_Drosophila? [3 pt; L3; I.A.4]

The two gene are linked and, therefore, assort independently.

The two genes are not linked and, therefore, assort independently.

The two gene are linked and, therefore, do not assort independently.

The two genes are not linked and, therefore, do not assort independently.

Case Study (questions #8-#14): You previously conducted an analysis of linkage in Drosophila melanogaster. In this analysis, you determined if two genes the sepia eye (se) and aldehyde oxidase (ao) genes were assorting independently. In a test cross, a female heterozygous at both loci was crossed with a male that was homozygous recessive at both loci. If the two genes assort independently (are not linked), you would expect equal numbers of progeny with each of the four possible phenotypes: ao*/se, aot/se, ao*/se and ao /se. The actual numbers of offspring obtained from the cross are given below. Using Microsoft Excele, perform an appropriate statistical test to evaluate the data and answer questions #8-#14. Phenotype ao* /se aot se ao se* ao*/se Number of Progeny 35 15 14 36

Explanation / Answer

9) Null hypothesis states that there is no significant difference between the observed populations and if there is any observable difference, it is mainly due to sampling or experimental error. The experiment was conducted to determine if the two genes sepia eyes (se) and aldehyde oxidase (ao) are assisting independently. Therefore, the null hypothesis for this particular experiment would be the genes are linked and therefore would not assort independently (option 2).

Please post other questions separately.

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