Principle of Inheritance and VariationMedium
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?
Options
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
Solution
Sol. [Key Concept: Incomplete dominance in snapdragon]
Let RR be red, Rr pink and rr white. The cross Rr × RR produces RR and Rr offspring in equal proportions. Thus the genotypic and phenotypic ratios are both 1:1, with red and pink flowers only; no white offspring are expected. Hence, option (4).
| × | R | R |
|---|---|---|
| R | RR | RR |
| r | Rr | Rr |
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