If yellow round, yellow wrinkled, green round and green wrinkled seeded progeny are obtained in equal proportions, the cross might be

Options

A. Monohybrid back cross
B. Dihybrid back cross
C. Monohybrid test cross
D. Dihybrid test cross

Answer

To solve the question regarding the cross that results in yellow round, yellow wrinkled, green round, and green wrinkled seeded progeny in equal proportions, we can follow these steps:

### Step-by-Step Solution:

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

2. **Determine the Types of Crosses**:
- The question provides four options: Monohybrid back cross, Dihybrid back cross, Monohybrid test cross, and Dihybrid test cross.
- Since we are dealing with two traits (color and shape), this indicates that we are looking at a dihybrid cross.

3. **Set Up the Dihybrid Cross**:
- For a dihybrid cross, we can start with a homozygous dominant for both traits (YYRR) crossed with a homozygous recessive for both traits (yyrr).
- This results in an F1 generation that is heterozygous for both traits (YyRr).

4. **Selfing the F1 Generation**:
- When the F1 generation (YyRr) is selfed (YyRr x YyRr), we can use a Punnett square to determine the offspring ratios.
- The expected phenotypic ratio from this selfing is 9:3:3:1 (9 yellow round, 3 yellow wrinkled, 3 green round, 1 green wrinkled).

5. **Understanding Equal Proportions**:
- The question states that the progeny are obtained in equal proportions (1:1:1:1).
- This indicates that we need to perform a test cross, where the heterozygous (YyRr) is crossed with a double recessive (yyrr).

6. **Performing the Test Cross**:
- The test cross (YyRr x yyrr) will yield offspring in a 1:1:1:1 ratio:
- YyRr (yellow round)
- Yyrr (yellow wrinkled)
- yyRr (green round)
- yyrr (green wrinkled)

7. **Conclusion**:
- Since the progeny are obtained in equal proportions, the correct type of cross is a **Dihybrid Test Cross**.

### Final Answer:
The cross that results in yellow round, yellow wrinkled, green round, and green wrinkled seeded progeny in equal proportions is a **Dihybrid Test Cross**.

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