A Hybrid Zone Between Two Species of Butterflies Contains Individuals

question 57

Multiple Choice

A hybrid zone between two species of butterflies contains individuals with widely varying genotypes, ranging from those matching both parental species to those with varying proportions of genes from the parental species.From this information one can infer that

• A) prezygotic isolating mechanisms are maintaining the hybrid zone.
• B) postzygotic isolating mechanisms are maintaining the hybrid zone.
• C) the hybrid zone is relatively old.
• D) the hybrid zone is relatively new.
• E) the hybrid zone has been reinforced.

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