Number of base pairs present in total DNA of human cell (human genome) is around

Options

A. `2.9xx10^(5)`
B. `2.9xx10^(8)`
C. `2.9xx10^(7)`
D. `2.9xx10^(9)`

Answer

To determine the number of base pairs present in the total DNA of a human cell (the human genome), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Human Genome**:
- The human genome consists of all the genetic material in a human cell. It is organized into chromosomes.

2. **Chromosome Count**:
- Humans have a total of 46 chromosomes in a diploid state (2n), which means there are 23 pairs of chromosomes.

3. **Haploid vs. Diploid**:
- The haploid set of chromosomes (n) contains only one chromosome from each pair. For humans, this means there are 23 chromosomes in the haploid state.

4. **Base Pairs in the Human Genome**:
- The total number of base pairs in the human genome is approximately 6 billion in the diploid state. Since we are considering the haploid set, we divide this number by 2.
- Therefore, in the haploid set, the number of base pairs is about 3 billion.

5. **Scientific Notation**:
- The number 3 billion can also be expressed in scientific notation as approximately 3 x 10^9.

6. **Conclusion**:
- Thus, the total number of base pairs present in the human genome is around **3 billion**.

### Final Answer:
The number of base pairs present in total DNA of a human cell (human genome) is around **3 billion**.

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