Question 5 Assume you discovered two new genetic traits in drosophila caused by two different mutations. In the first trait, you can clearly distinguish that the flies can have either 2 or 3 stripes on their body. For the other trait, you can distinguish yellow bodies in some flies and white bodies in others. You hypothesize that the stripe trait is controlled by 1 gene (where 2 stripes (S) is dominant over 3 stripes (s)) and that a different gene determines the body color (where white (W) is dominant over yellow (w)). You hypothesize that the genes are on different chromosomes. You set out to test your hypothesis, by crossing F1 heterozygote (in other words, dihybrids) male and female flies. Below is a table as it appears in YOUR lab book. You have already indicated the number of flies you have obtained for each combination of phenotypes. Perform a chi²-test by completing the table below to determine if your data is consistent with your hypotheses. Provide your reasoning by showing your work. Don't forget to provide the total variance, degrees of freedom and the p-value. Expected numbers Phenotypes Observe Hypothesized Phenotypic ratio Chi-square d F2 White 3 striped 41 Yellow, 3 striped 15 White, 2 striped 96 Yellow, 2 striped 37 Note: round the numbers at 2 decimals. A chi² table is provided on the next page.

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Table 1: Probability table of chi-square values
Probabilities
df
0.99
0.95
0.90
0.70
0.50
0.30
0.20
0.10
0.05
0.01
0.001
1
0.0001
0.004
0.016
0.15
0.46
1.07
1.64
2.71
3.84
6.64
10.83
0.02
0.10
0.21
0.71
1.39
2.41
3.22
4.61
5.99
9.21
13.82
3
0.12
0.35
0.58
1.42
2.37
3.67
4.64
6.25
7.82
11.35
16.27
4
0.30
0.71
1.06
2.20
3.36
4.88
5.99
7.78
9.49
13.28
18.47
0.55
1.15
1.61
3.00
4.35
6.06
7.29
9.24
11.07
15.09
20.52
6.
0.87
1.64
2.20
3.83
5.35
7.23
8.56
10.65
12.59
16.81
22.46
7
1.24
2.17
2.83
4.67
6.35
8.38
9.80
12.02
14.07
18.48
24.32
Transcribed Image Text:Table 1: Probability table of chi-square values Probabilities df 0.99 0.95 0.90 0.70 0.50 0.30 0.20 0.10 0.05 0.01 0.001 1 0.0001 0.004 0.016 0.15 0.46 1.07 1.64 2.71 3.84 6.64 10.83 0.02 0.10 0.21 0.71 1.39 2.41 3.22 4.61 5.99 9.21 13.82 3 0.12 0.35 0.58 1.42 2.37 3.67 4.64 6.25 7.82 11.35 16.27 4 0.30 0.71 1.06 2.20 3.36 4.88 5.99 7.78 9.49 13.28 18.47 0.55 1.15 1.61 3.00 4.35 6.06 7.29 9.24 11.07 15.09 20.52 6. 0.87 1.64 2.20 3.83 5.35 7.23 8.56 10.65 12.59 16.81 22.46 7 1.24 2.17 2.83 4.67 6.35 8.38 9.80 12.02 14.07 18.48 24.32
Question 5
Assume you discovered two new genetic traits in drosophila caused by two different mutations. In the first
trait, you can clearly distinguish that the flies can have either 2 or 3 stripes on their body. For the other trait,
you can distinguish yellow bodies in some flies and white bodies in others. You hypothesize that the stripe
trait is controlled by 1 gene (where 2 stripes (S) is dominant over 3 stripes (s)) and that a different gene
determines the body color (where white (W) is dominant over yellow (w)). You hypothesize that the
genes
are on different chromosomes.
You set out to test your hypothesis, by crossing F1 heterozygote (in other words, dihybrids) male and female
flies.
Below is a table as it appears in YOUR lab book. You have already indicated the number of flies you have
obtained for each combination of phenotypes.
Perform a chi²-test by completing the table below to determine if your data is consistent with your
hypotheses. Provide your reasoning by showing your work. Don't forget to provide the total variance,
degrees of freedom and the p-value.
Phenotypes
Expected
numbers
Observe
Hypothesized
Phenotypic
ratio
Chi-square
d F2
White 3 striped
41
Yellow, 3 striped
15
White, 2 striped
96
Yellow, 2 striped
37
Note: round the numbers at 2 decimals. A chi² table is provided on the next page.
Transcribed Image Text:Question 5 Assume you discovered two new genetic traits in drosophila caused by two different mutations. In the first trait, you can clearly distinguish that the flies can have either 2 or 3 stripes on their body. For the other trait, you can distinguish yellow bodies in some flies and white bodies in others. You hypothesize that the stripe trait is controlled by 1 gene (where 2 stripes (S) is dominant over 3 stripes (s)) and that a different gene determines the body color (where white (W) is dominant over yellow (w)). You hypothesize that the genes are on different chromosomes. You set out to test your hypothesis, by crossing F1 heterozygote (in other words, dihybrids) male and female flies. Below is a table as it appears in YOUR lab book. You have already indicated the number of flies you have obtained for each combination of phenotypes. Perform a chi²-test by completing the table below to determine if your data is consistent with your hypotheses. Provide your reasoning by showing your work. Don't forget to provide the total variance, degrees of freedom and the p-value. Phenotypes Expected numbers Observe Hypothesized Phenotypic ratio Chi-square d F2 White 3 striped 41 Yellow, 3 striped 15 White, 2 striped 96 Yellow, 2 striped 37 Note: round the numbers at 2 decimals. A chi² table is provided on the next page.
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