Question

A pink flowered snapdragon plant is crossed with white flowered snapdragon plant. What would be the ratio of red, pink and white flowered plants in F${}_1$ generation?
[0.7 mark]

• A. Red : Pink = 2 : 1
• B. Pink : White = 1 : 1
• C. Red : White = 1 : 1
• D. Red : Pink : White = 1 : 2 : 1

Answer 1

The correct option is B Pink : White = 1 : 1

In snapdragon (Antirrhinum), flower colour shows incomplete dominance. The heterozygous condition (Rr) develops pink coloured flowers.
The cross can be represented as follows:


Out of four plants, two are pink flowered and two are white flowered. Therefore, the ratio
Pink : White = 1 : 1