Question: 103. A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?
(1) Only red flowered plants
(2) Red flowered as well as pink flowered plants
(3) Only pink flowered plants
(4) Red, Pink as well as white flowered plants
Answer: Option (2)
Explanation:
In Snapdragon plants, flower colour shows incomplete dominance.
Let the allele for red flower colour be represented as R and
the allele for white flower colour as r.
A pink flowered plant has the genotype Rr,
while a red flowered plant has the genotype RR.
When a pink flowered plant Rr is crossed with a red flowered plant RR,
the gametes produced are R and r
from the pink plant and only R from the red plant.
The resulting progeny genotypes are RR and Rr.
RR plants show red flowers, while Rr plants show pink flowers.
Therefore, the progeny will consist of red flowered as well as pink flowered plants.