At the completion of meiosis I, each human cell contains

Options

A. 23 chromosomes, 46 chromatids
B. 46 chromosomes, 46 chromatids
C. 46 chromosomes, 92 chromatids
D. 23 chromosomes, 23 chromatids

Answer

### Step-by-Step Solution:

1. **Understanding the Starting Point**:
- In humans, a somatic cell (a typical body cell) contains 46 chromosomes, which is made up of 44 autosomes and 2 sex chromosomes (XY for males and XX for females).

2. **Meiosis Overview**:
- Meiosis consists of two rounds of division: meiosis I and meiosis II. At the end of meiosis I, the cell divides into two daughter cells.

3. **Homologous Chromosome Separation**:
- During meiosis I, homologous chromosomes (the pairs of chromosomes, one from each parent) are separated and move to opposite poles of the cell.

4. **Telophase I and Cytokinesis**:
- After the separation of homologous chromosomes, the cell enters telophase I. During this phase, the cell prepares to divide. Cytokinesis follows, which is the process where the cytoplasm divides, resulting in two new cells.

5. **Chromosome Count in Daughter Cells**:
- At the end of meiosis I, each daughter cell contains half the number of chromosomes as the original cell. Since the original cell had 46 chromosomes, each daughter cell will have 23 chromosomes.

6. **Chromatid Count**:
- Each chromosome consists of two sister chromatids. Therefore, if there are 23 chromosomes in each daughter cell, there will be a total of 46 chromatids (23 chromosomes x 2 chromatids per chromosome).

### Final Answer:
At the completion of meiosis I, each human cell contains **23 chromosomes** and **46 chromatids**.

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