Question

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 red flowered plants
• B. Red flowered as well as pink flowered plants
• C. Only pink flowered plants
• D. Red, Pink as well as White flowered plants

Answer 1

The Correct Option is B

In Snapdragon plants, flower color exhibits incomplete dominance, where neither allele is completely dominant over the other. When a red flowered Snapdragon (homozygous dominant, RR) is crossed with a pink flowered Snapdragon (heterozygous, Rr), the phenotypes of the progeny can be determined using a Punnett square.

	R	r
R	RR	Rr
R	RR	Rr

The resulting genotypes from this cross are as follows: 50% RR and 50% Rr. In terms of phenotype:

• RR results in red flowers.
• Rr results in pink flowers.

Therefore, the progeny will exhibit two phenotypes: red flowered and pink flowered plants.

Answer 2

In the case of incomplete dominance in Snapdragon plants, a cross between red (RR) and pink (Rr) flowered plants will produce progeny with red and pink flowers.

The red color is dominant over the pink color, but both can appear in the offspring.

Thus, the correct answer is (2) Red flowered as well as pink flowered plants.