Prezygotic barriers __________.

• A. prevent a hybrid zygote from developing into a viable, fertile adult
• B. are necessary in order for speciation to occur
• C. prevent donkeys and horses from mating
• D. only occur in asexual organisms
• E. prevent fertilization of gametes from members of closely related species

Answer: (E)

Verified step by step guidance

1. Understand the concept of prezygotic barriers: These are mechanisms that prevent fertilization from occurring between members of different species, thus preventing the formation of a hybrid zygote.
2. Recognize the types of prezygotic barriers: These can include temporal isolation (species breed at different times), habitat isolation (species live in different environments), behavioral isolation (differences in mating rituals), mechanical isolation (incompatibility of reproductive organs), and gametic isolation (incompatibility of gametes).
3. Analyze the options given in the problem: Evaluate each statement to determine if it correctly describes the function of prezygotic barriers.
4. Identify the correct statement: Prezygotic barriers prevent fertilization of gametes from members of closely related species, which aligns with the definition and function of these barriers.
5. Reflect on the importance of prezygotic barriers in speciation: These barriers are crucial as they maintain species boundaries and contribute to the process of speciation by preventing interbreeding between different species.