For a character regulated by two pairs of alleles, the expected segregation ratios in a particular experiment are 1:4:6:4:1. The observed numbers in each of the five categories were:
9 37 57 46 11
Are these results consistent with the postulated segregation ratios?
To verify those, we need to adopt a chisquare statistical test… and here is the test
Null hypothesis: The observed values are not deviating from the 1:4:6:4:1 ratio.
Chisquare test
|
Category |
CAT 1 |
CAT 2 |
CAT 3 |
CAT 4 |
CAT 5 |
Total |
|
Observed values |
9 |
37 |
57 |
46 |
11 |
160 |
|
Exptected Ratio |
1 |
4 |
6 |
4 |
1 |
16 |
|
Exprected Values |
10 |
40 |
60 |
40 |
10 |
160 |
|
Deviation |
-1 |
-3 |
-3 |
6 |
1 |
|
|
D^2 |
1 |
9 |
9 |
36 |
1 |
|
|
D^2/E |
0.1 |
0.225 |
0.15 |
0.9 |
0.1 |
1.475 |
|
X^2 |
1.475 |
|||||
|
Degrees of freedom |
5-1=4 |
Inference: The calculated chisquare value i.e. 1.475 is lessthan the table value i.e. 9.49 at 4 DF and 0.05 probability. Hence Null Hypothesis is accepted. Which means these results consistent with the postulated segregation ratios.
For a character regulated by two pairs of alleles, the expected segregation ratios in a particular...
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What are the independent variable, dependent variable, for
figures 11.8 what are the control and experimental group? Give a
prediction that support the hypothesis.
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