Selfing of hybrid yellow round seeded (YyRr) Pea plants, the phnotypes of next generation would be

Options

A. `15:1`
B. `9:7`
C. `12:3:1`
D. `9:3:3:1`

Answer

To determine the phenotypes of the next generation from the selfing of hybrid yellow round seeded (YyRr) pea plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Genotypes**:
- The hybrid yellow round seeded pea plant has the genotype YyRr, where:
- Y (yellow) is dominant over y (green).
- R (round) is dominant over r (wrinkled).

2. **Set Up the Cross**:
- When selfing the hybrid YyRr plants, we are essentially crossing YyRr with YyRr.

3. **Use a Punnett Square**:
- Create a 4x4 Punnett square to represent the gametes from each parent:
- Gametes from one parent: YR, Yr, yR, yr
- Gametes from the other parent: YR, Yr, yR, yr

4. **Fill in the Punnett Square**:
- The combinations from the Punnett square will be:
- YYRR, YYRr, YyRR, YyRr (Yellow Round)
- YYrr, Yyrr (Yellow Wrinkled)
- yyRR, yyRr (Green Round)
- yyrr (Green Wrinkled)

5. **Count the Phenotypic Ratios**:
- From the combinations, we can categorize the phenotypes:
- Yellow Round (YYRR, YYRr, YyRR, YyRr) = 9
- Yellow Wrinkled (YYrr, Yyrr) = 3
- Green Round (yyRR, yyRr) = 3
- Green Wrinkled (yyrr) = 1
- This gives us the phenotypic ratio of 9:3:3:1.

6. **Conclusion**:
- The phenotypes of the next generation from the selfing of YyRr pea plants will be in the ratio of 9:3:3:1.

### Final Answer:
The phenotypes of the next generation would be in the ratio of **9:3:3:1**.

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