Select the statements that is correct regarding arrhenotoky and thelytoky.

Options

A. In arrhenotoky , only males are produced by parthenogenesis , while in thelytoky only females are produced by parthenogenesis .
B. In arrhenotoky , only females are produced by parthenogenesis , while in thelytoky only males are produced by parthenogenesis .
C. In arrhenotoky , only either males or females are produced by parthenogenesis , while in thelytoky only females are produced by parthenogenesis .
D. In arrhenotoky , only males are produced by parthenogenesis , while in thelytoky either males or females are produced by parthenogenesis .

Answer

To solve the question regarding the correct statements about arrhenotoky and thelytoky, we will break down the concepts step by step.

### Step-by-Step Solution:

1. **Understanding Arrhenotoky:**
- Arrhenotoky, also known as arrhenotokous parthenogenesis, is a type of reproduction where unfertilized eggs develop into males.
- This process results in the production of haploid males.
- Example: In honey bees, the queen produces unfertilized eggs that develop into drones (males).

**Hint:** Remember that arrhenotoky leads to the production of males from unfertilized eggs.

2. **Understanding Thelytoky:**
- Thelytoky is the opposite of arrhenotoky. It is a type of parthenogenesis where unfertilized eggs develop into females.
- This results in the production of diploid females.
- Example: Aphids and certain species of bees exhibit thelytoky.

**Hint:** Thelytoky results in females being produced from unfertilized eggs.

3. **Analyzing the Statements:**
- **Statement 1:** "In arrhenotoky, only males are produced by parthenogenesis while in thelytoky, only females are produced by parthenogenesis."
- This statement is correct as it accurately describes both processes.

- **Statement 2:** "In arrhenotoky, only females are produced."
- This statement is incorrect because arrhenotoky produces only males.

- **Statement 3:** "In arrhenotoky, either male or female are produced."
- This statement is incorrect as arrhenotoky specifically results in males only.

- **Statement 4:** "In arrhenotoky, only males are produced by parthenogenesis while in thelytoky, either males or females are produced by parthenogenesis."
- This statement is incorrect because thelytoky specifically produces females, not either gender.

4. **Conclusion:**
- The correct statement regarding arrhenotoky and thelytoky is the first statement: "In arrhenotoky, only males are produced by parthenogenesis while in thelytoky, only females are produced by parthenogenesis."

### Final Answer:
- The correct statement is: **In arrhenotoky, only males are produced by parthenogenesis while in thelytoky, only females are produced by parthenogenesis.**