Which of the following is an example of hybrid sterility?

• A. A liger, the offspring of a lion and a tiger
• B. A hybrid plant that produces fertile seeds
• C. A hybrid sunflower that can reproduce with other sunflowers
• D. A mule, the offspring of a horse and a donkey

Answer: (D)

Verified step by step guidance

1. Understand the concept of hybrid sterility: Hybrid sterility is a postzygotic reproductive barrier where hybrid offspring are produced but are sterile and cannot reproduce.
2. Identify the characteristics of the given examples: A liger, a hybrid plant, a hybrid sunflower, and a mule.
3. Analyze the reproductive capabilities of each example: Determine if each hybrid can produce offspring.
4. Recognize that a mule, the offspring of a horse and a donkey, is typically sterile and cannot reproduce, which is a classic example of hybrid sterility.
5. Conclude that the correct example of hybrid sterility is the mule, as it fits the definition of producing sterile offspring.