Crossing a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon produces all pink snapdragons in the F₁ generation. If F₁ individuals are crossed, what will be the ratio of phenotypes in the F₂ generation?

Question

Quizplus · Accepted Answer

When crossing two FS1U1B11S1U1B0 individuals, we can set up a Punnett square to determine the possible genotypes of the FS1U1B12S1U1B0 offspring:

|   | FS1U1B12 | S1U1B12 |
|---|----------|---------|
| FS1U1B11 | FS1U1B12S1U1B11 (red) | FS1U1B11S1U1B12 (pink) |
| S1U1B11 | FS1U1B11S1U1B12 (pink) | S1U1B11S1U1B12 (white) |

From this Punnett square, we can see that the ratio of phenotypes in the FS1U1B12S1U1B0 generation will be 1 red: 2 pink: 1 white. Therefore, the correct answer is choice C.

Crossing a True-Breeding Red-Flowered Snapdragon with a True-Breeding White-Flowered Snapdragon