Person with Klinefelter's syndrome have chromosomes

Options

A. XX
B. XY
C. XXY
D. XYY

Answer

To answer the question regarding the chromosome composition of a person with Klinefelter's syndrome, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Klinefelter's Syndrome**:
- Klinefelter's syndrome is a genetic condition that affects males. It is characterized by the presence of an extra X chromosome.

2. **Chromosomal Composition**:
- Normally, males have one X and one Y chromosome (XY). In Klinefelter's syndrome, there is an additional X chromosome, leading to a chromosomal composition of XXY.

3. **Genotype Explanation**:
- The genotype for Klinefelter's syndrome can be represented as 44 + XXY. Here, '44' represents the 44 autosomes (22 pairs) and 'XXY' represents the sex chromosomes.

4. **Causes of Klinefelter's Syndrome**:
- This condition typically arises from the union of an abnormal egg (which has an extra X chromosome) and a normal sperm (which has a Y chromosome), or from a normal egg (with one X chromosome) and an abnormal sperm (which has an extra X chromosome).

5. **Characteristics of Individuals with Klinefelter's Syndrome**:
- Individuals with Klinefelter's syndrome often exhibit male characteristics but may also show some female secondary sexual characteristics, such as gynecomastia (breast development) and a feminine voice.

6. **Conclusion**:
- Therefore, the correct answer to the question is that a person with Klinefelter's syndrome has the chromosome composition of XXY.

### Final Answer:
A person with Klinefelter's syndrome has chromosomes XXY.

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