Question

which of the following is an example of reproductive isolation?
○ two populations of finches that cannot produce viable offspring
○ two populations of finches that have different feather colors
○ two populations of salamanders that live in different lakes
○ two populations of salamanders that have different tail lengths

Explanation:

Reproductive isolation refers to mechanisms that prevent different populations from interbreeding or producing viable, fertile offspring. Let's analyze each option:

• "Two populations of finches that cannot produce viable offspring": This fits reproductive isolation as it involves the inability to produce viable offspring, a key aspect of reproductive isolation.
• "Two populations of finches that have different feather colors": Different feather colors are a phenotypic difference, not related to reproductive isolation.
• "Two populations of salamanders that live in different lakes": This is geographic isolation (a pre - zygotic barrier, but the question is about reproductive isolation. Geographic isolation is a separate concept from reproductive isolation in terms of the definition here; reproductive isolation is about the ability to reproduce, not just living apart).
• "Two populations of salamanders that have different tail lengths": Different tail lengths are a phenotypic trait, not related to reproductive isolation.

Answer:

A. two populations of finches that cannot produce viable offspring