In a special type of inheritance, that controls seed size the $\mathrm{BB}, \mathrm{Bb}$ and bb are

Question

In a special type of inheritance, that controls seed size the $\mathrm{BB}, \mathrm{Bb}$ and bb are the three genotypes that controls seed shape and size of starch grains. Heterozygous genotype shows large seed but starch grain is of intermediate size and this indicates\ I. Manifold expression of a gene with unrelated phenotypes\ II. Incomplete dominance expression\ III. Polygenic inheritance expression\ IV. Many genes with same expression\

Professor PC Thomas Classes · Answer

Pleiotropy and incomplete dominance