Which of the following decides the sex of the child ?

Options

A. Male gamete i.e. , sperm
B. female gamete i.e., ovum
C. Both sperm and ovume
D. mother

Explanation

To determine which factor decides the sex of a child, we need to understand the roles of male and female gametes in reproduction.

### Step-by-Step Solution:

1. **Identify the Gametes**:
- The male gamete is called sperm, and the female gamete is called ovum (egg).

2. **Understand Chromosomes**:
- Humans have sex chromosomes that determine the sex of the child. There are two types of sex chromosomes: X and Y.
- Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

3. **Role of the Female Gamete (Ovum)**:
- The ovum always carries an X chromosome. Therefore, regardless of the circumstances, the ovum contributes an X chromosome to the child.

4. **Role of the Male Gamete (Sperm)**:
- The sperm can carry either an X or a Y chromosome.
- If a sperm carrying an X chromosome fertilizes the ovum, the resulting combination is XX, which is female.
- If a sperm carrying a Y chromosome fertilizes the ovum, the resulting combination is XY, which is male.

5. **Conclusion**:
- The sex of the child is determined by the type of sperm that fertilizes the ovum. Therefore, the male gamete (sperm) is the deciding factor in determining the sex of the child.

### Final Answer:
The correct answer is **Option A: Male gamete (sperm)**.

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