During mating, in which of these organisms do both the male and the female release gametes in large numbers in order to ensure that fertilization occurs in at least some gametes?

Options

A. Dog
B. Frog
C. Crow
D. Goat

Answer

**Step-by-Step Solution:**

1. **Understanding Gamete Release:** The question asks about organisms where both male and female release gametes in large numbers during mating. This is typically associated with external fertilization.

2. **Identifying Fertilization Types:** There are two main types of fertilization:
- **Internal Fertilization:** This occurs inside the female's body, leading to fewer gametes being produced since the developing embryos are protected.
- **External Fertilization:** This occurs outside the female's body, usually in an aquatic environment, where both male and female release a large number of gametes to increase the chances of fertilization.

3. **Analyzing the Given Organisms:**
- **Dog:** Dogs are mammals and exhibit internal fertilization, resulting in fewer offspring.
- **Frog:** Frogs are known for external fertilization, where females lay many eggs in water, and males release sperm over them. This increases the chances of fertilization despite the higher risk of egg loss.
- **Crow:** Crows also undergo internal fertilization, similar to dogs, leading to fewer eggs.
- **Goat:** Goats are mammals as well, and they also exhibit internal fertilization.

4. **Conclusion:** Among the listed organisms, the frog is the only one that releases a large number of gametes during mating due to external fertilization. Therefore, the correct answer is the frog.

**Final Answer:** The organism where both the male and female release gametes in large numbers during mating is the **Frog**.

---