Karyotype of a child shows trisomy of chromosome number 21. Identify the disorder and state the symptoms which are likely to be exhibited in this case.

Explanation

### Step-by-Step Solution:

1. **Understanding Karyotype**:
- A karyotype is a visual representation of an individual's chromosomes, organized in pairs. In this case, the karyotype shows a trisomy of chromosome number 21, which means there are three copies of chromosome 21 instead of the usual two.

2. **Identifying the Disorder**:
- The presence of an extra chromosome 21 is indicative of a genetic disorder known as **Down's syndrome** (also referred to as Trisomy 21). This condition arises due to nondisjunction during meiosis, leading to the extra chromosome.

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