Chi-Square Genetics Calculator
Test whether observed genetic ratios match expected Mendelian ratios using chi-square analysis.
Chi-Square Analysis
| Category | Observed (O) | Expected (E) | O - E | (O-E)²/E |
|---|---|---|---|---|
| Category 1 | 315 | 312.75 | 2.25 | 0.0162 |
| Category 2 | 101 | 104.25 | -3.25 | 0.1013 |
| Category 3 | 108 | 104.25 | 3.75 | 0.1349 |
| Category 4 | 32 | 34.75 | -2.75 | 0.2176 |
0.4700
Chi-Square (χ²)
3
Degrees of Freedom
7.815
Critical Value (p=0.05)
Not Significant
Result
Fail to reject null hypothesis - observed values are consistent with expected ratios
About Chi-Square Test in Genetics
The chi-square (χ²) test determines if observed genetic ratios differ significantly from expected Mendelian ratios. Formula: χ² = Σ[(O-E)²/E]. If χ² exceeds the critical value at your chosen significance level (usually 0.05), the difference is statistically significant.