Question

In Mirabilis jalapa, if the $F_1$ pink flowered plants are crossed with white-flowered plants, the progeny will be

• A. All pink flowered plants
• B. 1 pink : 2 red : 1 white
• C. 1 pink : 1 white
• D. 3 red : 1 white

Answer 1

Answer: (C)

	R	r
r	Rr (pink)	rr (white)
r	Rr (pink)	rr (white)

Crossing between F${}_1$ generation and the recessive parent is called a test cross.

After crossing of pink flowered plants with white-flowered plants, progeny obtained was in a ratio = 2: 2 (pink: white) i.e. 1: 1.

So, the correct option is '1 pink: 1 white'.