On crossing red & ehite flowered plants the ration of red and white flowered plnts in `F_(2)` generation was `60:20,` then on selfing the heterozygous red flowered plants, the offsprings would be :-

Options

A. `72:24`
B. `40:60`
C. `52:48`
D. `84:16`

Answer

To solve the problem, we need to analyze the genetic cross between red and white flowered plants and determine the offspring ratios when selfing heterozygous red flowered plants.

### Step-by-Step Solution:

1. **Identify the Parent Plants**:
- We have red flowered plants and white flowered plants. Let's denote the red flower allele as 'R' (dominant) and the white flower allele as 'r' (recessive).

2. **Determine the F1 Generation**:
- When we cross a homozygous red flowered plant (RR) with a homozygous white flowered plant (rr), all F1 offspring will be heterozygous red (Rr).

3. **Analyze the F2 Generation**:
- When the F1 plants (Rr) are selfed (Rr x Rr), we can use a Punnett square to determine the F2 generation.
- The Punnett square for Rr x Rr is as follows:
```
R r
------------
R | RR | Rr |
|-------|------|
r | Rr | rr |
```

4. **Count the Offspring**:
- From the Punnett square, we see the following genotypes:
- 1 RR (homozygous red)
- 2 Rr (heterozygous red)
- 1 rr (homozygous white)
- This gives us a phenotypic ratio of 3 red (1 RR + 2 Rr) to 1 white (1 rr).

5. **Confirm the Ratio**:
- The ratio of red to white flowered plants in the F2 generation is 3:1. Given that the question states the ratio of red to white flowered plants is 60:20, we can simplify this to 3:1, confirming our understanding.

6. **Determine the Offspring Ratio from Selfing Heterozygous Plants**:
- Since we are selfing the heterozygous red flowered plants (Rr), the offspring will also follow the 3:1 ratio of red to white flowers.

7. **Conclusion**:
- The offspring from selfing the heterozygous red flowered plants will yield a phenotypic ratio of 3 red flowered plants to 1 white flowered plant.

### Final Answer:
The offspring would be in the ratio of 3 red flowered plants to 1 white flowered plant (3:1).

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