In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in `F_(1)`-generation?

Options

A. `9:1`
B. `1:3`
C. `3:1`
D. `50:50`

Answer

To solve the problem, we need to determine the expected ratio of yellow and green seeded plants in the F1 generation when a heterozygous yellow seeded plant is crossed with a green seeded plant.

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- Yellow seeds are dominant (Y) and green seeds are recessive (y).
- The heterozygous yellow seeded plant has the genotype Yy (one dominant allele and one recessive allele).
- The green seeded plant, being homozygous recessive, has the genotype yy.

2. **Set Up the Cross**:
- We are crossing a heterozygous yellow seeded plant (Yy) with a homozygous green seeded plant (yy).
- The cross can be represented as:
- Yy (yellow) × yy (green)

3. **Determine the Gametes**:
- The gametes produced by the heterozygous yellow seeded plant (Yy) are Y and y.
- The gametes produced by the homozygous green seeded plant (yy) are both y (since it can only contribute the recessive allele).

4. **Perform the Punnett Square**:
- Create a Punnett square to visualize the possible offspring:
```
| y | y |
-----------------
Y | Yy | Yy |
-----------------
y | yy | yy |
```
- From the Punnett square, we can see the possible genotypes of the offspring:
- 2 Yy (yellow seeds)
- 2 yy (green seeds)

5. **Count the Phenotypes**:
- The phenotypes from the genotypes are:
- Yy (yellow seeds) = 2
- yy (green seeds) = 2

6. **Calculate the Ratio**:
- The ratio of yellow seeded plants to green seeded plants in the F1 generation is:
- Yellow:Green = 2:2, which simplifies to 1:1.

### Final Answer:
The expected ratio of yellow and green seeded plants in the F1 generation is **1:1**.

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