Human males have ____ different types of chromosomes.

Options

A. 23
B. 24
C. 46
D. 48

Answer

To determine how many different types of chromosomes human males have, we can break down the information as follows:

1. **Understanding Chromosome Types**: Human males have a total of 23 pairs of chromosomes. This includes 22 pairs of autosomes and 1 pair of sex chromosomes (XY).

2. **Counting Autosomes**: The 22 pairs of autosomes consist of 22 different types of chromosomes. Each pair has two homologous chromosomes, but they are considered the same type.

3. **Counting Sex Chromosomes**: The sex chromosomes in males are XY. Here, X and Y are different types of chromosomes. Therefore, we consider them as two additional types.

4. **Total Different Types of Chromosomes**:
- From the 22 pairs of autosomes, we have 22 types.
- From the sex chromosomes (XY), we have 2 types (X and Y).
- Adding these together gives us: 22 (autosomes) + 2 (sex chromosomes) = 24 different types of chromosomes.

5. **Conclusion**: Therefore, human males have a total of 24 different types of chromosomes.

### Final Answer:
Human males have **24 different types of chromosomes**.

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