A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?
Answer: (A) Red flowered as well as pink flowered plants. Answer: (A) Red flowered as well as pink flowered plants Solution: In snapdragon, flower colour shows incomplete dominance where RR is red, Rr is pink and rr is white.
- A.Red flowered as well as pink flowered plants✓
- B.Only pink flowered plants
- C.Red, Pink as well as white flowered plants
- D.Only red flowered plants
Correct Answer
(A) Red flowered as well as pink flowered plants
Solution & Explanation
Answer: (A) Red flowered as well as pink flowered plants Solution: In snapdragon, flower colour shows incomplete dominance where RR is red, Rr is pink and rr is white. A pink plant (Rr) crossed with a red plant (RR) gives offspring 1/2 RR (red) and 1/2 Rr (pink). No white (rr) is possible since no parent contributes an r-r combination, so the progeny are red and pink. NCERT Reference: NCERT Class XII, Ch 4, p.60, lines 10-15: "the F1 (Rr) was pink (Figure 4.6). When the F1 was self-pollinated the F2 resulted in the following ratio 1 (RR) Red: 2 (Rr) Pink: 1 (rr) White."