Question

Which of the following is a post mating isolating mechanism?

• A. Mechanical isolation
• B. Hybrid sterility
• C. Physiological isolation
• D. Ethological isolation

Answer 1

The correct option is B Hybrid sterility

Isolating mechanism is the phenomenon by which two species are prevented from fusing due to their reproductive characteristics. It is of two types, premating isolating mechanism and post-mating isolating mechanism. Pre-mating isolating mechanism includes temporal isolation, ecological or habitat isolation, ethological isolation, physiological isolation, genetic isolation, behavioral isolation and mechanical isolation. Post-mating isolating mechanism includes gametic incompatibility, zygotic mortality, hybrid inviability, hybrid sterility and hybrid breakdown.

Thus, the correct answer is 'Hybrid sterility.'