In fruit flies normals wings are dominate to long wings In a
In fruit flies, normals wings are dominate to long wings. In a cross Nn Nn, the results were 274 normal winged, 58 long winged. Perform an x^2 analysis to determine if the results fit your hypothesis (show hypothesis)
Solution
Answer:
Normal wings dominant genotype = NN and Nn
Long wings are recessive, genotype= nn
Cross between genotypes= Nn x Nn
= NN, Nn,nN, nn
Three wings normal and one long wing.
The ratio is 3:1,
If the number of individuals are 332, for 3:1 ratio, the expected values should be 249 : 83
To perform chisquare analysis,
Chi-square value (d2/e) = 10
The deviation is high, so it doesnt fit.
| Normal wings | Long wings | |
| Observed (o) | 274 | 58 |
| Expected (e) | 249 | 83 |
| Deviation (o-e) | 25 | -25 |
| Deviation(d2) | 625 | 625 |
| d2/e | 625/ 249 = 2.51 | 625/83= 7.5 |
