What is the phenotypic ratio of the progeny obtained in a cross between a female plant with GgIi and a male plant with ggii?

Options

A. `9:3:3:1`
B. `1:1:1:1`
C. `1:2:2:1`
D. `3:9:3:1`

Answer

To determine the phenotypic ratio of the progeny obtained from the cross between a female plant with genotype GgIi and a male plant with genotype ggii, we can follow these steps:

### Step 1: Identify the Genotypes of the Parents
- Female plant: GgIi (heterozygous for both traits)
- Male plant: ggii (homozygous recessive for both traits)

### Step 2: Determine the Gametes Produced by Each Parent
- The female plant (GgIi) can produce the following gametes:
- GI
- Gi
- gI
- gi

- The male plant (ggii) can only produce one type of gamete:
- gi

### Step 3: Perform the Punnett Square
Now, we will set up a Punnett square to visualize the potential combinations of the gametes from both parents.

| | gi |
|---------|----------|
| **GI** | GgIi |
| **Gi** | Ggii |
| **gI** | ggIi |
| **gi** | ggii |

### Step 4: Analyze the Offspring Genotypes
From the Punnett square, we can see the following genotypes of the offspring:
1. GgIi (1)
2. Ggii (1)
3. ggIi (1)
4. ggii (1)

### Step 5: Determine the Phenotypes
Now we can determine the phenotypes based on the genotypes:
- GgIi: Dominant for both traits (Phenotype A)
- Ggii: Dominant for the first trait and recessive for the second (Phenotype B)
- ggIi: Recessive for the first trait and dominant for the second (Phenotype C)
- ggii: Recessive for both traits (Phenotype D)

### Step 6: Count the Phenotypes
Each phenotype appears once, leading to the following phenotypic ratio:
- Phenotype A: 1
- Phenotype B: 1
- Phenotype C: 1
- Phenotype D: 1

### Step 7: Write the Final Phenotypic Ratio
Thus, the phenotypic ratio of the progeny is:
**1:1:1:1**

### Conclusion
The correct answer is option B: 1:1:1:1.

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