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 plant would you expect in `F_(1)` generation

Options

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

Answer

To solve the problem of determining the ratio of yellow to green seeded plants in the F1 generation when a heterozygous yellow seeded pea plant is crossed with a green seeded plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Alleles:**
- Yellow seeds are dominant (denoted as 'Y').
- Green seeds are recessive (denoted as 'y').

2. **Determine the Genotypes of the Parents:**
- The heterozygous yellow seeded plant has the genotype 'Yy'.
- The green seeded plant, being homozygous recessive, has the genotype 'yy'.

3. **Gamete Formation:**
- The heterozygous plant (Yy) can produce two types of gametes: 'Y' and 'y'.
- The green seeded plant (yy) can only produce one type of gamete: 'y'.

4. **Cross the Gametes:**
- Set up a Punnett square to visualize the cross:
```
Y | y
----------------
y | Yy | yy
----------------
y | Yy | yy
```
- From the Punnett square, we see the possible combinations:
- 'Yy' (heterozygous yellow)
- 'yy' (homozygous green)

5. **Determine the Phenotypes:**
- 'Yy' will express the yellow phenotype (since yellow is dominant).
- 'yy' will express the green phenotype.

6. **Count the Ratios:**
- From the Punnett square, we have:
- 2 plants with the genotype 'Yy' (yellow seeds)
- 2 plants with the genotype 'yy' (green seeds)
- This results in a ratio of 1 yellow seeded plant to 1 green seeded plant.

7. **Final Ratio:**
- Therefore, the expected ratio of yellow to green seeded plants in the F1 generation is 1:1.

### Conclusion:
The ratio of yellow to green seeded plants in the F1 generation is 1:1.

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