Which of the following is a sterile hybrid

Options

A. donkey
B. yak
C. mule
D. sheep

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Sterile Hybrid":**
- A sterile hybrid is an organism that results from the crossbreeding of two different species but is unable to produce viable gametes (sperms or eggs). This means that the hybrid cannot reproduce.

2. **Identifying the Options:**
- The options provided are: Donkey, Yak, Mule, and Sheep.

3. **Analyzing Each Option:**
- **Donkey:** A true animal species, not a hybrid.
- **Yak:** A true animal species, not a hybrid.
- **Sheep:** A true animal species, not a hybrid.
- **Mule:** A hybrid resulting from the crossbreeding of a female horse and a male donkey.

4. **Determining the Sterility of the Hybrid:**
- Mules are known to be sterile because they have an uneven number of chromosomes (63) which prevents proper gamete formation. Therefore, they cannot produce offspring.

5. **Conclusion:**
- Among the options provided, the only sterile hybrid is the Mule.

**Final Answer:**
- The sterile hybrid among the options is **Mule**.

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