Question

Which of the following is not a prezygotic isolating mechanism?

Options

• Chemical environment of female reproductive tract being inhospitable to sperm

• Incompatible courtship rituals

• Mechanical incompatibility of genitalia

• Production of genetically inviable hybrids

Answer 1

Production of genetically inviable hybrids

Explanation:

Prezygotic isolating mechanisms prevent fertilization from occurring. Examples include an inhospitable chemical environment of the female reproductive tract to sperm, incompatible courtship rituals, and mechanical incompatibility of genitalia, all prevent mating or fertilization. On the other hand, the production of genetically inviable hybrids is a postzygotic isolating mechanism that occurs after fertilization and prevents the survival or reproduction of hybrid offspring.