Multiple Choice
Which of the following isolating mechanisms is considered postzygotic?
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23. Speciation
Introduction to Speciation
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Which of the following is NOT an example of a prezygotic barrier to reproduction?
A
Mechanical isolation
B
Behavioral isolation
C
Hybrid sterility
D
Temporal isolation
Verified step by step guidance1
Step 1: Understand the concept of prezygotic barriers. Prezygotic barriers are mechanisms that prevent fertilization from occurring between different species. These barriers act before the formation of a zygote (fertilized egg). Examples include mechanical isolation, behavioral isolation, and temporal isolation.
Step 2: Contrast prezygotic barriers with postzygotic barriers. Postzygotic barriers occur after fertilization and typically involve issues with the viability or fertility of the resulting hybrid offspring. Hybrid sterility is an example of a postzygotic barrier.
Step 3: Analyze the options provided in the question. Mechanical isolation refers to physical incompatibilities between reproductive structures, behavioral isolation involves differences in mating behaviors, and temporal isolation occurs when species reproduce at different times. All of these are prezygotic barriers.
Step 4: Identify the option that does not fit the definition of a prezygotic barrier. Hybrid sterility, which refers to the inability of hybrid offspring to reproduce, occurs after fertilization and is therefore a postzygotic barrier.
Step 5: Conclude that the correct answer is 'Hybrid sterility,' as it is not an example of a prezygotic barrier to reproduction.
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