A women with 47 chromosomes due to three copies of chromosomes 21 is charactericzed by :

Options

A. Turner syndrome
B. Down syndrome
C. Superfemaleness
D. Triploidy

Answer

To solve the question regarding a woman with 47 chromosomes due to three copies of chromosome 21, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosomal Count**:
- Humans typically have 46 chromosomes, arranged in 23 pairs. However, in this case, the woman has 47 chromosomes.

2. **Identify the Anomaly**:
- The presence of three copies of chromosome 21 indicates a condition known as trisomy 21. This means that instead of the normal two copies of chromosome 21, there are three.

3. **Recognize the Condition**:
- Trisomy 21 is commonly known as Down syndrome. It is characterized by a set of physical and developmental features that arise from the extra chromosome.

4. **Differentiate from Other Syndromes**:
- The question also mentions other syndromes like Turner syndrome and super femaleness. Turner syndrome involves the absence of one X chromosome (45 chromosomes total), while super femaleness involves three X chromosomes (47 chromosomes total). Neither of these conditions corresponds to the presence of three copies of chromosome 21.

5. **Conclude the Answer**:
- Since the woman has 47 chromosomes due to three copies of chromosome 21, the correct characterization is Down syndrome.

### Final Answer:
The woman is characterized by **Down syndrome**.

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