The gametes of female determines the sex of a child in :

Options

A. Grasshopper
B. Drosophila
C. Cockroach
D. Peacock

Answer

To solve the question, "The gametes of female determines the sex of a child in:", we need to analyze the sex determination mechanisms in the given options: Grasshopper, Drosophila, Cockroach, and Birds (Pickaxe).

### Step-by-Step Solution:

1. **Understanding Sex Determination in Grasshopper**:
- In Grasshoppers, males have one X chromosome (X0) and females have two X chromosomes (XX).
- The sex of the offspring is determined by the male gamete (sperm), which can either carry an X chromosome or no sex chromosome at all. Therefore, the female gamete does not determine the sex of the offspring.

**Hint**: Check the sex chromosome composition of males and females in each organism.

2. **Understanding Sex Determination in Drosophila**:
- In Drosophila (fruit flies), males are XY (heterogametic) and females are XX (homogametic).
- Similar to Grasshoppers, the male gamete determines the sex of the offspring, as it can contribute either an X or a Y chromosome.

**Hint**: Look for the heterogametic and homogametic sex in the species.

3. **Understanding Sex Determination in Cockroach**:
- In Cockroaches, the sex determination is also similar to that of Drosophila, where males are XY and females are XX.
- Again, the male gamete determines the sex of the offspring.

**Hint**: Compare the gametes of both sexes to see which one determines the offspring's sex.

4. **Understanding Sex Determination in Birds (Pickaxe)**:
- In birds, the sex determination system is different. Females are heterogametic (ZW) and males are homogametic (ZZ).
- In this case, the female gamete (which can be either Z or W) determines the sex of the offspring. If the egg carries a Z chromosome, the offspring will be male (ZZ), and if it carries a W chromosome, the offspring will be female (ZW).

**Hint**: Identify which sex's gametes are responsible for determining the sex of the offspring.

5. **Conclusion**:
- Based on the analysis, the correct answer is **D. Birds (Pickaxe)**, as the female gametes determine the sex of the child in this case.

### Final Answer:
The gametes of the female determine the sex of a child in **D. Birds (Pickaxe)**.