State the chromosomal defect in individuals with Turner's syndrome.

Explanation

**Step-by-Step Solution:**

1. **Understanding Turner's Syndrome**: Turner's syndrome is a genetic disorder that affects females and is classified as a chromosomal disorder. It is characterized by the absence of one of the two X chromosomes typically found in females.

2. **Normal Chromosomal Composition**: In normal females, the chromosomal composition is XX, meaning they have two X chromosomes. Males have an XY composition, consisting of one X and one Y chromosome.

3. **Chromosomal Aberration in Turner's Syndrome**: In individuals with Turner's syndrome, there is a chromosomal aberration where instead of having two X chromosomes (XX), there is only one X chromosome present. This condition is denoted as XO, indicating the absence of one X chromosome.

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