A patient comes to the clinic with a genetic disorder characterized by a webbed neck and the presence of rudimentary ovaries. This person most likely has

Options

A. two X and one Y sex chromosomes
B. only one sex chromosome which is X
C. three `21^(st)` chromosome
D. three X chromosomes

Answer

To solve the question regarding the genetic disorder characterized by a webbed neck and rudimentary ovaries, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Symptoms**: The patient presents with a webbed neck and rudimentary ovaries. These symptoms are key indicators of a specific genetic disorder.

2. **Understand Genetic Disorders**: Genetic disorders can arise from chromosomal abnormalities. In this case, we are looking for a disorder that affects the sex chromosomes.

3. **Normal Chromosomal Composition**: A typical human cell has 46 chromosomes, consisting of 44 autosomes and 2 sex chromosomes (XX for females and XY for males).

4. **Analyze the Symptoms**: The presence of rudimentary ovaries suggests that the individual has female characteristics. However, the term "rudimentary" indicates that these ovaries are not fully developed or functional, which implies a chromosomal anomaly.

5. **Consider Chromosomal Anomalies**:
- If the individual had a normal female chromosomal pattern, they would have two X chromosomes (XX).
- The presence of a webbed neck and rudimentary ovaries suggests a condition where there is a missing or incomplete sex chromosome.

6. **Identify Turner's Syndrome**: The symptoms described align with Turner's syndrome, which is characterized by the presence of a single X chromosome (XO). Individuals with Turner's syndrome typically have:
- A webbed neck
- Rudimentary ovaries
- Sterility due to non-functional ovaries

7. **Eliminate Other Options**:
- Klinefelter syndrome (XXY) would not present with rudimentary ovaries, as this condition is male.
- Down syndrome (trisomy 21) does not involve sex chromosomes and does not match the symptoms.
- Other chromosomal abnormalities involving more than two X chromosomes (like XXX) do not fit the symptom profile either.

8. **Conclusion**: Based on the analysis, the patient most likely has Turner's syndrome (XO), which explains the observed symptoms of a webbed neck and rudimentary ovaries.

### Final Answer:
The patient most likely has **Turner's syndrome**.

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