Question

Choose the correct answers from the alternatives given.
The reproductive barrier that maintains the species boundary between horses and donkeys is

• A. mechanical isolation
• B. gametic isolation
• C. hybrid inviability
• D. hybrid sterility

Answer 1

The correct option is D hybrid sterility

In Hybrid sterility, Hybrid zygotes sometimes develop into adults, such as mules ( between female horses and male donkeys), but the adults fail to develop functional gametes and are sterile. That's mean mule have no ability to produce a live child.

So, the correct answer is hybrid sterility.