(Online) 3832-E01 hw3-2 (Compatibility Mode ngs Review View AaBbCcDdEe AaBbCcDdE
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(Online) 3832-E01 hw3-2 (Compatibility Mode ngs Review View AaBbCcDdEe AaBbCcDdEe AaBbCcD NormalNo Spacing Heading 1 AShley Woire 3832 E01-Homework week #3 1. You've performed a dihybcid testcross for the unlinked A and B genes. Below are the numbers of offspring in each genotypic class. Genotype ObservedExpected (TOTAL 400)X 97 102 112 89 | (97.100? 7 100-0.09 | (102-100) 100-0.04 (112-100)7100= 1.44 -16x400-225 100 3/16 x 400 = 75 100 A/a B/b A/a b/b a/a B/b a/a b/b 75 100 25 100 (89-100/100 -121 1/16 x 400·25 100 Total-2.78 What is the X value for this data? (As with all math-based problems... you need to show your work. Shown work is a non-insignificant part of the points you'll earn on math-based questions ALWAYS.) a) -expec expected X2 = sum[ b) OK. So do these results significantly differ from the expected results? (yes or no) This rejects the null hypothesis The loci for the D and G genes of a plant are 20 map units apart on chromosome #3. If a cis heterorygote were testcrossed, roughly what percentage of the offspring would express the dominant D phenotype but the recessive G phenotype? Make sure you explain yourself/show whatever work there is to show. 2. DG/dg CIS DG/dg x de/dgExplanation / Answer
1. The answer is :
Null hypothesis: The observed values are not deviating from the dihybrid cross ratio i.e. 9:3:3:1.
Chisquare test:
Category
A_B_
A_bb
aaB_
aabb
Total
Observed values (O)
97
102
112
89
400
Exptected Ratio
9
3
3
1
16
Exprected Values`(E)
225
75
75
25
Deviation (D= O-E)
-128
27
37
64
D^2
16384
729
1369
4096
D^2/E
72.81778
9.72
18.25333
163.84
264.6311
X^2
264.6311
Degrees of freedom
4
-
1
3
Inference: The calculated chisquare value i.e. 264.63 is greater than the table value i.e. 7.82 at 3 DF and 0.05 probability. Hence the null hypothesis is rejected.
a) The calculated chisquare value i.e. 264.63
b) As the calcualted chisquare value is greater than the tbale value, the null hypothesis is rejected.
Category
A_B_
A_bb
aaB_
aabb
Total
Observed values (O)
97
102
112
89
400
Exptected Ratio
9
3
3
1
16
Exprected Values`(E)
225
75
75
25
Deviation (D= O-E)
-128
27
37
64
D^2
16384
729
1369
4096
D^2/E
72.81778
9.72
18.25333
163.84
264.6311
X^2
264.6311
Degrees of freedom
4
-
1
3
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