A presumed dihybrid in Drosophila B/b ; F/f is testcrossed to b/b ; f/f. (B = black body; b = brown body; F = forked bristles; f = unforked bristles.)
The results were:
Black, forked 230
Black, unforked 210
Brown, forked 240
Brown, unforked 250
Use the chi-square test to determine if these results fit the results expected from testcrossing the hypothesized dihybrid.
Homework Answers
Null hypothesis - B and F genes show independent assortment.
BbFf × bbff
| Gametes | bf |
| BF | BbFf |
| Bf | Bbff |
| bF | bbFf |
| bf | bbff |
Expected ratio = 1 : 1 : 1 : 1
Total # progenies = 230 + 210 + 240 + 250 = 930
Expected # of each type of progeny = 232.5
Chi square test -
| Genotype | #observed | #expected | (O-E)^2/E |
| BbFf | 230 | 232.5 | 0.026 |
| Bbff | 210 | 232.5 | 2.177 |
| bbFf | 240 | 232.5 | 0.241 |
| bbff | 250 | 232.5 | 1.317 |
Chi square value = 0.026 + 2.177 + 0.241 + 1.317 = 3.761
DOF = 4 - 1 = 3
p value = 0.1 to 0.9
Null hypothesis accepted.
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A presumed dihybrid in Drosophila B/b ; F/f is testcrossed to
b/b ; f/f. (B =...
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JUST PART B PLEASE AND THANK YOU TABLE OF CHI SQUARED VALUES. D.F = DEGREES OF...
JUST PART B PLEASE AND THANK YOU
TABLE OF CHI SQUARED VALUES. D.F = DEGREES OF FREEDOM
df
<0.10
<0.05
<0.01
<0.001
1
2.706
3.841
6.635
10.8
2
4.605
5.991
9.210
13.8
3
6.251
7.815
11.345
16.3
4
7.779
9.488
13.277
18.5
5
9.236
11.070
15.086
20.5
6
10.645
12.592
16.812
22.4
8
13.362
15.507
20.090
26.1
10
15.987
18.307
23.209
29.6
12
18.549
21.026
26.217
32.9
20
28.412
31.410
37.566
45.3
25
34.382
37.652
44.314
52.6
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also what is Ho: and Ha:
would i use the p value and alpha value to come up with the
conclusion or the alpha value and degrees of freedom from the x^2
table.
3. A gambler thinks that a die may be loaded, that is, the six numbers are not equally likely To test his suspicion, he rolled the die 150 times and obtained the following results: Number: 1 2 3 4 5 6 gume Frequency: 23 26 23 21...
13. Multiple choice: Select the best answer. (4pts) In storm crabs, red eyes (ry+) is dominant to blue eyes (ry), and spines (spt) is dominant to no spines (sp). You performed a test cross with a crab heterozygous for these characteristics. Which of the following chi-squared values would indicate significant linkage between these two loci? You may consult the table below. a. 0.025 b. 0.121 c. 0.455 d. 1.887 e. 4.432 f. None of the above are significant. f None...
JUST PART B PLEASE AND THANK YOU
TABLE OF CHI SQUARED VALUES. D.F = DEGREES OF FREEDOM
df
<0.10
<0.05
<0.01
<0.001
1
2.706
3.841
6.635
10.8
2
4.605
5.991
9.210
13.8
3
6.251
7.815
11.345
16.3
4
7.779
9.488
13.277
18.5
5
9.236
11.070
15.086
20.5
6
10.645
12.592
16.812
22.4
8
13.362
15.507
20.090
26.1
10
15.987
18.307
23.209
29.6
12
18.549
21.026
26.217
32.9
20
28.412
31.410
37.566
45.3
25
34.382
37.652
44.314
52.6
Rules for Assigning...
12) You want to test your hypothesis that the purple and wrinkled genes in corn are linked. You cross a corn plant that breeds true for the dominant traits of purple, wrinkled kernels (PP ss) with a plant breeds true for yellow, smooth kernels (pp SS). You then cross the offspring with a yellow, wrinkled tester and obtain offspring with the phenotypes listed below. In the blank after each phenotype, indicate with an R or a P whether that type...
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l. (why?) Finally, r apur By the number of moles of vapor to obtain the molecular mass. molecular massmoles of vapor Determine the average molecular mass of the unknown from your three trials. (You may use the best two trials if one is very different from the others.) Questions: 1. If the outside of your flask is not dry when the first mass determination is made and it is dried for the second mass determination, what effect will that have...
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