Pairs of homologuous chromosomes present in humans is

Options

A. 46
B. 44
C. 23
D. 22

Answer

To solve the question regarding the number of pairs of homologous chromosomes present in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Total Number of Chromosomes in Humans**:
- Humans have a total of 46 chromosomes.

2. **Identify the Types of Chromosomes**:
- Out of these 46 chromosomes, there are 44 autosomes (non-sex chromosomes) and 2 sex chromosomes.

3. **Determine the Pairs of Chromosomes**:
- Chromosomes are organized into pairs. Since humans have 46 chromosomes, this means there are 23 pairs of chromosomes in total (46 divided by 2).

4. **Differentiate Between Homologous and Non-Homologous Chromosomes**:
- Homologous chromosomes are pairs that consist of one chromosome from each parent. In humans, the 44 autosomes can be paired up, making 22 pairs of homologous chromosomes.

5. **Consider the Sex Chromosomes**:
- The sex chromosomes in humans are X and Y. In males, these are not homologous (XY), while in females, both are X (XX), making them homologous. However, when considering the general case, we treat the sex chromosomes as non-homologous (XY).

6. **Conclusion**:
- Therefore, the total number of pairs of homologous chromosomes in humans is 22 pairs (from the autosomes), as the sex chromosomes do not form a homologous pair in males.

### Final Answer:
The number of pairs of homologous chromosomes present in humans is **22**.

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