a. Trisomy of 21st chromosome
b. Palm crease
c. Partialy open mouth
d. Retarded psychomotor development
Above information is related with

Options

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

Answer

To solve the question regarding the symptoms provided, we will analyze each symptom step by step and connect them to the appropriate genetic disorder.

### Step 1: Identify the Symptoms
The symptoms given are:
- Trisomy of the 21st chromosome
- Palm crease
- Partially open mouth
- Retarded psychomotor development

### Step 2: Understand Trisomy
Trisomy refers to a genetic condition where there is an extra chromosome. In this case, it specifically mentions the 21st chromosome, which indicates that there are three copies of chromosome 21 instead of the usual two.

### Step 3: Link Trisomy 21 to a Condition
The condition associated with trisomy of the 21st chromosome is known as Down syndrome. This is a well-documented genetic disorder characterized by the presence of an extra copy of chromosome 21.

### Step 4: Analyze Other Symptoms
- **Palm crease**: Individuals with Down syndrome often have a single transverse palmar crease, which is a common physical trait.
- **Partially open mouth**: People with Down syndrome may have a characteristic facial appearance, including a partially open mouth and a protruding tongue.
- **Retarded psychomotor development**: Down syndrome is associated with developmental delays, including psychomotor retardation.

### Step 5: Conclusion
All the symptoms listed in the question align with the characteristics of Down syndrome. Therefore, the information provided is related to Down syndrome.

### Final Answer
The answer is Down syndrome.

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