What will be the phenotypic ratio of offsprings of `F_(2)` generation obtained by selfing of `F_(1)` plant having AABbCC genotype

Options

A. `3:1`
B. `1:1`
C. `0:3:3:1`
D. `27:9:9:9:3:3:3:1`

Answer

To determine the phenotypic ratio of the offspring in the F2 generation obtained by selfing an F1 plant with the genotype AABbCC, we can follow these steps:

### Step 1: Identify the Genotype of the F1 Plant
The F1 plant has the genotype AABbCC. This means:
- A is homozygous dominant (AA)
- B is heterozygous (Bb)
- C is homozygous dominant (CC)

### Step 2: Determine the Gametes Produced by the F1 Plant
The F1 plant can produce the following types of gametes:
- From AA, it can only produce A.
- From Bb, it can produce B or b.
- From CC, it can only produce C.

Thus, the possible gametes are:
- ABC (from A, B, and C)
- AbC (from A, b, and C)

### Step 3: Set Up the Punnett Square
To find the F2 generation, we will perform a self-cross of the F1 plant (ABC x AbC). This involves creating a Punnett square:

| | ABC | AbC |
|-------|-------|-------|
| **ABC** | AABBCC | AABbCC |
| **AbC** | AABBCc | AABbCc |

### Step 4: Determine the Phenotypes
Now, we can analyze the phenotypes from the combinations in the Punnett square:
1. AABBCc - Phenotype: A_B_C (dominant traits)
2. AABbCC - Phenotype: A_B_C (dominant traits)
3. AABbCc - Phenotype: A_B_C (dominant traits)
4. AABbCC - Phenotype: A_B_C (dominant traits)

Since A is homozygous dominant, all offspring will express the dominant trait for A. The B trait is heterozygous, so we will have a mix of phenotypes for B, and C is homozygous dominant, so all offspring will express the dominant trait for C.

### Step 5: Calculate the Phenotypic Ratio
From the combinations, we can summarize the phenotypes:
- All offspring will show the dominant phenotype for A and C.
- For B, since it is heterozygous, we will have a 3:1 ratio for the B trait.

Thus, the overall phenotypic ratio in the F2 generation will be:
- 3 (A_B_C) : 1 (A_bb_C)

### Final Answer
The phenotypic ratio of the offspring of the F2 generation is **3:1**.

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