2024 Principles of Inheritance and VariationIncomplete Dominance in Snapdragon Medium Question 15 of 198 in Principles of Inheritance and Variation

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

A Only pink flowered plants
B Red, Pink as well as white flowered plants
C Only red flowered plants
D Red flowered as well as pink flowered plants

The answer is D.

Solution

Flower colour in snapdragon shows incomplete dominance: RR = red, Rr = pink, rr = white. Pink (Rr) × Red (RR) gives RR (red) and Rr (pink) in a 1 : 1 ratio. So both red flowered and pink flowered plants are expected.

Concept Cross between pink (heterozygous) and red (homozygous) snapdragon

Principles of Inheritance and Variation in past papers

198 questions from this chapter have appeared across 27 exam years.