Due to the cross between TTRr `xx` ttrr the resultant progenies showed how many percent plants would be, tall, red flowered :-

Options

A. `50%`
B. `75%`
C. `25%`
D. `100%`

Answer

To solve the problem of determining the percentage of tall red-flowered plants resulting from the cross between TTRr (homozygous tall, heterozygous red) and ttrr (homozygous dwarf, homozygous white) plants, we can follow these steps:

### Step 1: Identify the Genotypes of the Parents
- Parent 1: TTRr (homozygous tall, heterozygous red)
- Parent 2: ttrr (homozygous dwarf, homozygous white)

### Step 2: Determine the Gametes Produced by Each Parent
- Parent 1 (TTRr) can produce two types of gametes:
- TR (from T and R)
- Tr (from T and r)

- Parent 2 (ttrr) can only produce one type of gamete:
- tr (from t and r)

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

| | tr |
|---------|------------|
| **TR** | TtRr |
| **Tr** | Ttrr |

### Step 4: Analyze the Offspring Genotypes
From the Punnett square, we can see the following offspring genotypes:
1. TtRr (Tall, Red)
2. Ttrr (Tall, White)

### Step 5: Determine the Phenotypes
- TtRr: Tall and Red (dominant traits)
- Ttrr: Tall and White (tall is dominant, but red is recessive)

### Step 6: Calculate the Percentage of Tall Red Flowered Plants
Out of the two offspring:
- 1 is Tall and Red (TtRr)
- 1 is Tall and White (Ttrr)

Thus, the percentage of tall red-flowered plants is:
- \( \frac{1 \text{ (Tall, Red)}}{2 \text{ (Total Offspring)}} \times 100 = 50\% \)

### Final Answer
The percentage of plants that would be tall and red-flowered is **50%**.

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