No gene interaction in the production of feather color in budgerigar parakeets

A 9:3:3:1 ratio results from the independent assortment of alleles in a dihybrid cross of greenfeathered budgies with the dihybrid genotype BbYyA 9:3:3:1 ratio results from the independent assortment of alleles in a dihybrid cross of greenfeathered budgies with the dihybrid genotype BbYy

% Precursor—+—> BIue—> 3— y_ Precursor—T—* Yellow—> b ‘7 1-3—6 Precursor ;// No pigment Bbe bbY_ Precursor T» Yellow—> X % Precursor—L» BIue—> B_yy Precursor T/ No pigment 1—1—6 Precursor —// No pigment bbyy Precursor fi/ No pigment I V Bb Yy