A yellow round seeded Pea plant is crossed with green wrinkled seeded pea plant. Four phenotypes appeared in the progeny in the ratio of 1:1:1:1. The genotype of the two are

Options

A. YyRr and yyrr
B. YYRR and yyrr
C. YYRr and yyrr
D. YyRR and yyrr.

Answer

To solve the problem, we need to determine the genotypes of the two parent pea plants based on the given information about their phenotypes and the resulting progeny.

### Step-by-Step Solution:

1. **Identify the Traits**:
- The traits mentioned are seed color (yellow vs. green) and seed shape (round vs. wrinkled).
- Yellow (Y) is dominant over green (y), and round (R) is dominant over wrinkled (r).

2. **Determine the Phenotypes of Parents**:
- The first parent is a yellow round seeded pea plant. Since yellow and round are dominant traits, this plant can be either homozygous dominant (YYRR) or heterozygous (YyRr).
- The second parent is a green wrinkled seeded pea plant. Since both traits are recessive, its genotype must be homozygous recessive (yyrr).

3. **Perform the Cross**:
- We will assume the first parent is heterozygous for both traits (YyRr) because the resulting progeny shows a 1:1:1:1 ratio, which indicates a test cross.
- The cross is YyRr (yellow round) x yyrr (green wrinkled).

4. **Determine the Gametes**:
- The gametes from the first parent (YyRr) can be YR, Yr, yR, and yr.
- The gametes from the second parent (yyrr) can only be yr.

5. **Punnett Square Analysis**:
- When we set up a Punnett square for this cross, we will have the following combinations:
- YyRr (yellow round)
- Yyrr (yellow wrinkled)
- yyRr (green round)
- yyrr (green wrinkled)

6. **Phenotypic Ratio**:
- The resulting phenotypes from the cross will be:
- 1 Yellow Round (YyRr)
- 1 Yellow Wrinkled (Yyrr)
- 1 Green Round (yyRr)
- 1 Green Wrinkled (yyrr)
- This results in a 1:1:1:1 ratio of phenotypes.

7. **Conclusion**:
- Therefore, the genotypes of the two parent plants are:
- Yellow Round Seeded Pea Plant: **YyRr**
- Green Wrinkled Seeded Pea Plant: **yyrr**

### Final Answer:
- The genotype of the yellow round seeded pea plant is **YyRr**.
- The genotype of the green wrinkled seeded pea plant is **yyrr**.