To quickly verify epistatic ratios, ensure the sum of the ratio parts always equals 16:
- Complementary (Duplicate Recessive) $\rightarrow$ \( 9 + 7 = 16 \)
- Dominant $\rightarrow$ \( 12 + 3 + 1 = 16 \)
- Duplicate Dominant $\rightarrow$ \( 15 + 1 = 16 \)
- Polymeric $\rightarrow$ \( 9 + 6 + 1 = 16 \)