Question

If a homozygous dominant red-flowered snapdragon plant (R) is crossed with a recessive homozygous white flowered plant (r), the offspring would be

• A. Half red-flowered
• B. Half white-flowered
• C. All pink-flowered
• D. Half pink-flowered

Answer 1

The correct option is C All pink-flowered

Snapdragon is an example of incomplete dominance. With incomplete dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype, i.e., a blending of the parental traits.

For example, If a homozygous red-flowered plant is crossed with a homozygous white flowered plant, the offspring would be all pink-flowered.

Parents : RR x rr

Phenotype : Red flowered White flowered

Gametes : R r

Offspring : Rr, Rr

Phenotype : Pink coloured flowered (Incomplete dominance)