A duplicated chromosome has how many chromatids

Options

A. One
B. Two
C. Three
D. Four

Explanation

To determine how many chromatids a duplicated chromosome has, follow these steps:

### Step-by-Step Solution:

1. **Understand Chromosome Duplication**:
- A duplicated chromosome refers to a chromosome that has undergone DNA replication. This process results in two identical copies of the chromosome.

2. **Identify the Structures**:
- After duplication, each chromosome consists of two identical structures known as sister chromatids.

3. **Connection at the Centromere**:
- These sister chromatids are joined together at a region called the centromere. This is crucial for the proper segregation of chromatids during cell division.

4. **Count the Chromatids**:
- Since there are two identical sister chromatids formed from the duplication of a single chromosome, the total number of chromatids in a duplicated chromosome is 2.

5. **Final Answer**:
- Therefore, a duplicated chromosome has **2 chromatids**.