A heterozygous round seeded (Rr) plant is crossed to recessive wrinkled (rr) seeded plant. The progeny would be:

Options

A. 303 rounded : 301 wrinkled
B. 301 rounded : 100 wrinkled
C. 20 round :99 wrinkled
D. 99 rounded : 301 wrinkled.

Answer

To solve the problem of determining the progeny from a cross between a heterozygous round-seeded plant (Rr) and a recessive wrinkled-seeded plant (rr), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- The heterozygous round-seeded plant has the genotype Rr (where R represents the dominant round seed trait and r represents the recessive wrinkled seed trait).
- The recessive wrinkled-seeded plant has the genotype rr.

2. **Set Up the Punnett Square**:
- Create a Punnett square to visualize the possible combinations of alleles from the parents.
- The alleles from the Rr parent can be either R or r.
- The alleles from the rr parent can only be r.

| | r | r |
|-----|-----|-----|
| R | Rr | Rr |
| r | rr | rr |

3. **Determine the Progeny Genotypes**:
- From the Punnett square, we can see the possible genotypes of the offspring:
- Rr (round seeds)
- Rr (round seeds)
- rr (wrinkled seeds)
- rr (wrinkled seeds)

4. **Count the Progeny**:
- There are a total of 4 offspring:
- 2 Rr (round seeds)
- 2 rr (wrinkled seeds)

5. **Calculate the Ratios**:
- The ratio of round-seeded to wrinkled-seeded plants is 2:2, which simplifies to 1:1.

### Conclusion:
The progeny from the cross between a heterozygous round-seeded plant (Rr) and a recessive wrinkled-seeded plant (rr) will be in the ratio of 1 round-seeded (Rr) to 1 wrinkled-seeded (rr).

### Final Answer:
The progeny would be 50% round-seeded plants and 50% wrinkled-seeded plants, which is a 1:1 ratio.

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