At metaphase of mitosis, each chromosome consists of ____ chromatid (s) ____ centromere(s) ____ kinetochore(s) and ____ molecules of DNA-

Options

A. 2, 1, 2, 2
B. 2, 2, 2, 2
C. 2, 1, 1, 1
D. 2, 1, 2, 1

Answer

To answer the question regarding the characteristics of chromosomes at metaphase of mitosis, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Chromatids**: At metaphase, each chromosome is made up of two identical sister chromatids. This is because DNA replication occurs during the S phase of interphase, resulting in two copies of each chromosome.

**Answer**: 2 chromatids

2. **Identifying Centromeres**: Each chromosome has one centromere, which is the region where the two sister chromatids are joined together. The centromere is crucial for the movement of chromosomes during cell division.

**Answer**: 1 centromere

3. **Recognizing Kinetochores**: Each chromatid has a kinetochore, which is a protein structure that forms at the centromere during cell division. Since there are two sister chromatids, there will be two kinetochores, one on each chromatid.

**Answer**: 2 kinetochores

4. **Counting DNA Molecules**: Since each chromatid contains one molecule of DNA, and there are two chromatids, there will be two DNA molecules in total for each chromosome at this stage.

**Answer**: 2 molecules of DNA

### Final Answer:
At metaphase of mitosis, each chromosome consists of **2 chromatids**, **1 centromere**, **2 kinetochores**, and **2 molecules of DNA**.

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