In humanbeings trisomy in 23rd pair results in

Options

A. Klinefelter syndrome
B. Down's syndrome
C. Turner syndrome
D. Down's female

Answer

To solve the question regarding what trisomy in the 23rd pair results in for human beings, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Trisomy**:
- Trisomy is a chromosomal condition where there is an additional chromosome in a pair. In humans, there are 23 pairs of chromosomes, making a total of 46 chromosomes.

**Hint**: Remember that trisomy means having three copies of a chromosome instead of the usual two.

2. **Identify the 23rd Pair**:
- The 23rd pair of chromosomes in humans consists of the sex chromosomes, which determine an individual's sex. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

**Hint**: The 23rd pair is crucial as it relates to sex determination in humans.

3. **Determine the Effect of Trisomy in the 23rd Pair**:
- If there is trisomy in the 23rd pair, it means there is an extra chromosome in this pair. In the case of females, this would lead to an additional X chromosome (XXX), and in the case of males, it would lead to an additional Y chromosome (XYY).

**Hint**: Think about how an extra chromosome can affect physical and genetic traits.

4. **Identify the Resulting Conditions**:
- The most common condition associated with trisomy of the 21st chromosome is Down syndrome. However, for the 23rd pair, the conditions are different.
- For females with an extra X chromosome (XXX), it is known as Triple X syndrome, and for males with an extra Y chromosome (XYY), it is known as XYY syndrome.

**Hint**: Look for specific names of syndromes that relate to the extra chromosome in the 23rd pair.

5. **Conclusion**:
- Therefore, trisomy in the 23rd pair results in conditions such as Triple X syndrome in females or XYY syndrome in males, but it is important to note that the question may be asking for the most recognized condition, which is often Down syndrome associated with the 21st chromosome.

**Hint**: Always clarify which chromosome is being referred to when discussing trisomy.

### Final Answer:
Trisomy in the 23rd pair of chromosomes in humans can lead to conditions such as Triple X syndrome (in females) or XYY syndrome (in males).