Question

Explain the inheritance of flower colour in four O'clock plant. How is it different from flower colour in garden pea?

Answer 1

In four O’clock plant (Mirabilis jalapa), red RR crossed with white rr produces pink Rr in F₁. Selfing F₁ gives F₂ in the ratio 1 red : 2 pink : 1 white, showing incomplete dominance. In garden pea, violet is completely dominant over white, so the F₁ is violet and the F₂ phenotypic ratio is 3 : 1.