How does hybrid sterility differ from hybrid breakdown?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Hybrid Sterility:**
- Hybrid sterility occurs when the first generation (F1) of hybrids is sterile and cannot reproduce. This means that the offspring produced from the mating of two different species or varieties are unable to produce any further generations.

2. **Example of Hybrid Sterility:**
- A classic example of hybrid sterility is the mule, which is the offspring of a horse and a donkey. Mules are sterile due to the difference in chromosome numbers between horses and donkeys, preventing them from producing viable gametes.

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