Find out the correct statement .

Options

A. Genetic makeup of the egg determines the sex of the child in human.
B. Genetic makeup of the sperm determines the sex of the child in human.
C. XO and XY type of sex determination is an example of female heterogamety .
D. ZZ and ZW type of sex determination is an example of male heterogamety .

Answer

To solve the question of identifying the correct statement regarding sex determination in humans, we will analyze each option step by step.

### Step 1: Analyze the First Option
**Statement:** The genetic makeup of the egg determines the sex of the child in humans.
- **Analysis:** This statement is incorrect. In humans, the sex of the child is determined by the sperm, not the egg. The egg always contributes an X chromosome, while the sperm can contribute either an X or a Y chromosome. Therefore, it is the sperm that determines the sex.

**Hint:** Remember that in humans, the egg contributes only X chromosomes, while the sperm can contribute either X or Y.

### Step 2: Analyze the Second Option
**Statement:** The genetic makeup of the sperm determines the sex of the child in humans.
- **Analysis:** This statement is correct. As mentioned earlier, the sperm can carry either an X or a Y chromosome. If the sperm carries an X chromosome, the child will be female (XX), and if it carries a Y chromosome, the child will be male (XY).

**Hint:** Focus on the role of the sperm in determining the sex of the offspring.

### Step 3: Analyze the Third Option
**Statement:** XO and XY type of sex determination is an example of female heterogamety.
- **Analysis:** This statement is incorrect. In the XO/XY system, females are XX (homogametic) and males are XY (heterogametic). Therefore, this system is an example of male heterogamety.

**Hint:** Recall the definitions of homogametic and heterogametic sexes in the context of sex determination systems.

### Step 4: Analyze the Fourth Option
**Statement:** ZZ and ZW type of sex determination is an example of male heterogamety.
- **Analysis:** This statement is also incorrect. In the ZZ/ZW system, males are ZZ (homogametic) and females are ZW (heterogametic). Thus, this system represents female heterogamety.

**Hint:** Remember that in the ZZ/ZW system, the ZW combination indicates the female sex.

### Conclusion
After analyzing all the options, we find that the only correct statement is the second option: "The genetic makeup of the sperm determines the sex of the child in humans."

### Final Answer:
**Correct Statement:** The genetic makeup of the sperm determines the sex of the child in humans.