Answered: A dihybrid testcross is made to…

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 8RQ: What are the types of gametes that can be produced by an individual with the genotype AaBb? a. Aa,Bb...

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Question

A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.

1. The chi-square value is the sum for all progeny classes of (observed-expected)2/expected. Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked. What is the chi-square value?

2. Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?

3. Using table 5.2 find the most accurate range within which the p value falls.

4. What is a reasonable conclusion based on the chi-square analysis?

TABLE 5.2 Critical Chi-Square Values
Values
0.99 0.90 0.50 0.10
0.05 0.01 0.001
Degrees of
Freedom
Values
1
0.02 0.45 2.71
3.84 6.64 10.83
0.02 0.21 1.39 4.61
5.99
9.21 13.82
3
0.11 0.58 2.37 6.25
7.81 11.35 16.27
4.
0.30 1.06 3.36 7.78
9.49 13.28 18.47
0.55 1.61
4.35 9.24
11.07
15.09 20.52

Parent genotypes:
Сс Dd x сс dd
Cc Dd
222
Cc dd
280
Progeny genotypes:
сc Dd
280
cc dd
218
1000

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