Red nad tall dominant character hybrid plant when crossed with recessive white dwarf plant (RrTt`xx` rrtt). What will be the ratio of respective four combinations red tall, and dwarf, white tall and white dwarf plants in the next generation :-

Options

A. `9:3:3:1`
B. `15:1:0:0`
C. `9:3:4:0`
D. 4:4:4:4`

Answer

To solve the problem of determining the ratio of the offspring from the cross between a red tall dominant hybrid plant (RrTt) and a recessive white dwarf plant (rrtt), we can follow these steps:

### Step 1: Identify the Genotypes
- The genotype of the red tall hybrid plant is **RrTt** (heterozygous for both traits).
- The genotype of the white dwarf plant is **rrtt** (homozygous recessive for both traits).

### Step 2: Determine the Gametes
- The hybrid plant (RrTt) can produce four types of gametes due to the combination of alleles:
- RT (dominant red and dominant tall)
- Rt (dominant red and recessive dwarf)
- rT (recessive white and dominant tall)
- rt (recessive white and recessive dwarf)

- The recessive plant (rrtt) can only produce one type of gamete:
- rt (recessive white and recessive dwarf)

### Step 3: Set Up a Punnett Square
- We will create a Punnett square to visualize the combinations of the gametes from both parents.

```
rt
---------------
RT | RrTt (Red Tall)
Rt | Rrtt (Red Dwarf)
rT | rrTt (White Tall)
rt | rrtt (White Dwarf)
```

### Step 4: Analyze the Offspring
From the Punnett square, we can see the following combinations:
1. RrTt (Red Tall)
2. Rrtt (Red Dwarf)
3. rrTt (White Tall)
4. rrtt (White Dwarf)

### Step 5: Count the Ratios
- Each combination appears once in the Punnett square:
- Red Tall (RrTt): 1
- Red Dwarf (Rrtt): 1
- White Tall (rrTt): 1
- White Dwarf (rrtt): 1

### Step 6: Write the Final Ratio
The ratio of the respective combinations in the next generation is:
- Red Tall : Red Dwarf : White Tall : White Dwarf = 1 : 1 : 1 : 1

### Final Answer
The ratio of red tall, red dwarf, white tall, and white dwarf plants in the next generation is **1:1:1:1**.

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