Question

In snapdragon, when pink flowers are crossed with white flowers then ratio of pink flowers and white flowers in the progeny is

• A. 10% Red
• B. Red and white in 3 : 1 ratio
• C. Pink and white in 1 : 1 ratio
• D. Pink red and white in 1 : 2 : 1 ratio

Answer 1

The correct option is C Pink and white in 1 : 1 ratio

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

Snapdragon shows incomplete dominance where both the genes express themselves equally in the heterozygous state.

The genotype of pink flowers= Rr

The genotype of white flowers= rr

In above cross Rr : rr = 2 : 2 = 1 : 1

Therefore, pink and white flowers are in equal proportions.

So, the correct option is 'Pink and white in 1 : 1 ratio'.