Question

A. Practice Problems Use a calculator to calculate ?² in the two examples that follow. The ?² values you should obtain are given. If the value you obtain does not agree with the value given, repeat the calculation until agreement is reached. Notice how the ?² calculated is interpreted. 1. In a cross involving Drosophila melanogaster, an F? population included 272 flies with long (normal) wings and 60 flies with dumpy wings. Calculate ?² and fill in the blanks below. Do these results approximate a 3:1 ratio? Phenotype O E O - E (O - E)² (O - E)²/E Normal Dumpy Totals ?² = Instructor's calculation of ?² = 8.4980 a. In interpreting this ?² value, you have ________ degrees of freedom. b. In this case, do you accept/reject the hypothesis that these data approximate a 3:1 ratio? c. What is the probability that the deviations are due to chance alone? 2. In a dihybrid test cross, the following results were obtained: A-B-, 121; A-bb, 107; aaB-, 115; and aabb, 93. Do these data approximate a dihybrid test cross ratio with independent assortment? Complete the following table and answer the related questions.

          A. Practice Problems
Use a calculator to calculate ?² in the two examples that follow. The ?² values you should obtain are given. If the value you obtain does not agree with the value given, repeat the calculation until agreement is reached. Notice how the ?² calculated is interpreted.

1. In a cross involving Drosophila melanogaster, an F? population included 272 flies with long (normal) wings and 60 flies with dumpy wings. Calculate ?² and fill in the blanks below. Do these results approximate a 3:1 ratio?

Phenotype O E O - E (O - E)² (O - E)²/E
Normal
Dumpy
Totals ?² =
Instructor's calculation of ?² = 8.4980

a. In interpreting this ?² value, you have ________ degrees of freedom.
b. In this case, do you accept/reject the hypothesis that these data approximate a 3:1 ratio?

c. What is the probability that the deviations are due to chance alone?

2. In a dihybrid test cross, the following results were obtained: A-B-, 121; A-bb, 107; aaB-, 115; and aabb, 93. Do these data approximate a dihybrid test cross ratio with independent assortment? Complete the following table and answer the related questions.

A. Practice Problems
Use a calculator to calculate ?² in the two examples that follow. The ?² values you should obtain are given. If the value you obtain does not agree with the value given, repeat the calculation until agreement is reached. Notice how the ?² calculated is interpreted.

1. In a cross involving Drosophila melanogaster, an F? population included 272 flies with long (normal) wings and 60 flies with dumpy wings. Calculate ?² and fill in the blanks below. Do these results approximate a 3:1 ratio?

Phenotype O E O - E (O - E)² (O - E)²/E
Normal
Dumpy
Totals ?² =
Instructor's calculation of ?² = 8.4980

a. In interpreting this ?² value, you have degrees of freedom.
b. In this case, do you accept/reject the hypothesis that these data approximate a 3:1 ratio?

c. What is the probability that the deviations are due to chance alone?

2. In a dihybrid test cross, the following results were obtained: A-B-, 121; A-bb, 107; aaB-, 115; and aabb, 93. Do these data approximate a dihybrid test cross ratio with independent assortment? Complete the following table and answer the related questions.

Added by Kiara H.

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