Assume that we know that the genotypes of the parents were d
Assume that we know that the genotypes of the parents were determined accurately: what is another potential explanation for why we may see a deviation from the expected values (i.e. a large 2 value)?
 Assume that we know that the genotypes of the parents were determined accurately: what is another potential explanation for why we may see a deviation from the expected values (i.e. a large 2 value)?
 Assume that we know that the genotypes of the parents were determined accurately: what is another potential explanation for why we may see a deviation from the expected values (i.e. a large 2 value)?
Solution
1. Either the null hypothesis is not correct
or
2. The null hypothesis is correct but our data are unusual.
| If your calculated X2 value is large enough or there are large differences between the observed and the expected then you can say that the data do not fit the model so you will have to reject the null hypothesis. | 

