A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by :

Options

A. Down's syndrome
B. Triploidy
C. Turner's syndrome
D. Super femaleness

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 Chromosome Count**:
- Humans typically have 46 chromosomes, arranged in 23 pairs. Each pair consists of one chromosome from each parent.

2. **Identify the Anomaly**:
- The question states that the woman has 47 chromosomes. This indicates that there is an extra chromosome present.

3. **Determine the Specific Chromosome Involved**:
- The question specifies that there are three copies of chromosome 21. This condition is known as trisomy, where "tri-" indicates three copies.

4. **Recognize the Syndrome Associated with This Condition**:
- The presence of an extra copy of chromosome 21 is specifically associated with Down syndrome. This is also referred to as trisomy 21.

5. **Confirm the Genetic Representation**:
- In genetic terms, this condition can be represented as 45 + XX (for females) or 45 + XY (for males), indicating that there is an additional chromosome, leading to a total of 47 chromosomes.

6. **Eliminate Other Options**:
- Triploidy refers to having three complete sets of chromosomes (3n), which is not the case here.
- Turner syndrome is characterized by the absence of one X chromosome (represented as 44 + XO).
- Superfemales have extra X chromosomes (represented as 44 + XXX).

7. **Conclusion**:
- Therefore, the correct answer to the question is that the woman is characterized by Down syndrome, or trisomy 21.

### Final Answer:
**Down syndrome (trisomy 21)**

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