Two heterozygous red-eyed flies are crossed. The results are shown below. Determine the chi-square value and...
Two heterozygous red-eyed flies are crossed. The results are shown below. Determine the chi-square value and round to the nearest hundreth. Expected ratio is 3:1
Red eyes - 134
White eyes - 66
Homework Answers
Let R be the allele for red-eye and r for white eye
The expected ratio of red to the white eye is 3:1.
or 3/4 red-eye flies and 1/4 white eye flies
Total progenies = 134+ 66 = 200
Expected red-eye flies - 3/4*200 = 150
Expected white-eye flies - 1/4*200 = 50.
| Observed | Expected | O-E | (O-E)2 | (O-E)2/E | |
| Red | 134 | 150 | -16 | 256 | 1.706667 |
| White | 66 | 50 | 16 | 256 | 5.12 |
| Total | 200 | 6.826667 |
So the Chi-square value is 6.826.
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