Question

In Snapdragons, tall (DD) is dominant over dwarf (dd) and Red (RR) are incompletely dominant over white (rr), the hybrid being pink. A pure tall white is crossed to a pure dwarf red and F₂ are self fertilized. Give the expected genotype and phenotype in F₁ and F₂ generations.

Answer 1

F_{2 generation}

_{Phenotypic ratio :} 

_{Tall Red -3}

_{Tall Pink -6}

_{Tall White -3}

_{Dwraf Red -1}

_{Dwarf  White -1}

_{Dwraf Pink -2}

_{Genotypic ratio :}

_{DDRR - 1 DdRR - 2 DDrr - 1}

_{DDRr - 2 DdRr - 4 ddRR - 1}

_{Ddrr - 2 ddRr - 2 ddrr -1}