Q. 9:3:3:1 ratio is modified to 9 : 7 ratio due to

 1874  213 WBJEEWBJEE 2007 Report Error

Solution:

The complementary genes are two pairs of non allelic genes which interact to produce only one phenotypic trait, but neither of them if present alone produces the phenotypic trait in absence of other. The phenotypic ratio in generation is 9 : 7, .e.g., flower color in Liilhyrns.