Structures present in a cell which is responsible for determination of the sex of a baby is

Options

A. cytoplasm
B. cell membrane
C. nucleus
D. chromosome

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the structures in a cell that are responsible for determining the sex of a baby.

2. **Identifying Cell Structures**: In a cell, there are several structures such as the cytoplasm, cell membrane, nucleus, and chromosomes. We need to identify which of these is responsible for sex determination.

3. **Analyzing Each Structure**:
- **Cytoplasm**: This is the jelly-like substance within the cell that holds organelles but does not determine sex.
- **Cell Membrane**: This structure protects the cell and regulates what enters and exits but does not play a role in sex determination.
- **Nucleus**: This is the control center of the cell that contains genetic material, but it is not the direct determinant of sex.
- **Chromosomes**: These are structures within the nucleus that carry genetic information. They are crucial for determining the sex of an individual.

4. **Focusing on Chromosomes**: Chromosomes come in pairs, and humans have a total of 46 chromosomes, which are organized into 23 pairs. The 23rd pair consists of sex chromosomes, which are different in males and females:
- Females have two X chromosomes (XX).
- Males have one X and one Y chromosome (XY).

5. **Conclusion**: Since the sex chromosomes (XX or XY) are responsible for determining the sex of a baby, the correct answer is **chromosomes**.

6. **Final Answer**: The structures present in a cell that are responsible for the determination of the sex of a baby are **chromosomes**.

---