Which is not true for haplodiploid sex determination ?

Options

A. It is reported in honey bees.
B. In this type , the male produces sperms by meiosis
C. They do not have a father and thus cannot have sons .
D. In this type, the unfertilized egg develops as a male by means of parthenogenesis.

Answer

To solve the question regarding haplodiploid sex determination, we will analyze each statement provided in the options and identify which one is not true.

### Step-by-Step Solution:

1. **Understanding Haplodiploid Sex Determination**:
- In haplodiploid sex determination, males are produced from unfertilized eggs and are haploid (having one set of chromosomes).
- Females are produced from fertilized eggs and are diploid (having two sets of chromosomes).

2. **Evaluating the Statements**:
- **Statement 1**: "It is reported in honey bees."
- This statement is true. Honey bees exhibit haplodiploid sex determination where males (drones) develop from unfertilized eggs and females (workers and queens) develop from fertilized eggs.

- **Statement 2**: "In this type, the male produces sperm by meiosis."
- This statement is **not true**. In haplodiploid organisms, males are haploid and produce sperm through mitosis, not meiosis. Since they have only one set of chromosomes, they do not undergo meiosis to produce gametes.

- **Statement 3**: "They do not have a father and thus cannot have sons."
- This statement is true. Males, being haploid and developing from unfertilized eggs, do not have a father, and thus cannot produce sons in the traditional sense.

- **Statement 4**: "In this type, unfertilized eggs develop as males by the means of Parthenogenesis."
- This statement is also true. The development of males from unfertilized eggs is a form of parthenogenesis.

3. **Conclusion**:
- The statement that is not true regarding haplodiploid sex determination is **Statement 2**: "In this type, the male produces sperm by meiosis."

### Final Answer:
The statement that is not true for haplodiploid sex determination is: **"In this type, the male produces sperm by meiosis."**

---