Human dental formula is :

Options

A. `3142//3143`
B. `1003//1003`
C. `2123//2123 `
D. `3143//3143`

Answer

To answer the question about the human dental formula, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Jaw**:
- The human jaw is divided into two parts: the upper jaw (maxilla) and the lower jaw (mandible).

2. **Bilateral Division**:
- Each jaw can be further divided into left and right halves. This means we can analyze one side of the jaw first.

3. **Identify Types of Teeth**:
- On one side of the jaw, we categorize the teeth into four types:
- **Incisors**: 2
- **Canines**: 1
- **Premolars**: 2
- **Molars**: 3

4. **Write the Dental Formula**:
- The dental formula for one side of the jaw is represented as: **2-1-2-3**.

5. **Calculate for Both Sides**:
- Since there are two sides (left and right) in both the upper and lower jaws, we multiply the formula by 2 for each jaw:
- Upper jaw: 2-1-2-3
- Lower jaw: 2-1-2-3

6. **Combine the Formulas**:
- The complete dental formula for humans is written as:
- **2-1-2-3 / 2-1-2-3** (where the first part represents the upper jaw and the second part represents the lower jaw).

7. **Total Number of Teeth**:
- To find the total number of teeth, we add the numbers in the formula:
- (2 + 1 + 2 + 3) = 8 for one side.
- Since there are two sides, we multiply by 2: 8 x 2 = 16.
- Finally, since there are 4 quadrants (upper left, upper right, lower left, lower right), we multiply by 2 again: 16 x 2 = 32.

### Final Answer:
- The human dental formula is **2-1-2-3 / 2-1-2-3**, and the total number of teeth is **32**.

---