Swallowtail butterflies are present on each island of an archipelago. Each island’s population differs subtly from those of other islands in morphology, especially in wing shape and color. What type of approach would be the most successful to determine whether the different populations are distinct species or not?Group of answer choicesInvestigating the wing shape of both populationsStudy the fitness of the offspring of crosses of butterflies from both populationsStudying the wing color of both populationsUsing molecular data to study the phylogenetic relationship between both populationsQuantify the number of mating events between butterflies of each population when put in contact in the lab
Question
Swallowtail butterflies are present on each island of an archipelago. Each island’s population differs subtly from those of other islands in morphology, especially in wing shape and color. What type of approach would be the most successful to determine whether the different populations are distinct species or not?Group of answer choicesInvestigating the wing shape of both populationsStudy the fitness of the offspring of crosses of butterflies from both populationsStudying the wing color of both populationsUsing molecular data to study the phylogenetic relationship between both populationsQuantify the number of mating events between butterflies of each population when put in contact in the lab
Solution
To determine whether the different populations of Swallowtail butterflies on each island are distinct species or not, the most successful approach would be to use molecular data to study the phylogenetic relationship between both populations.
Here's why:
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Investigating the wing shape and color of both populations: While these morphological differences can indicate variation, they do not necessarily mean that the populations are distinct species. Environmental factors can cause populations to adapt different physical traits without speciating.
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Study the fitness of the offspring of crosses of butterflies from both populations: This could provide some insight, but it's not definitive. Even if the offspring are less fit, it doesn't necessarily mean the parents are different species.
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Quantify the number of mating events between butterflies of each population when put in contact in the lab: This could also provide some insight, but again, it's not definitive. Just because two populations don't mate frequently doesn't necessarily mean they're different species.
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Using molecular data to study the phylogenetic relationship between both populations: This is the most definitive method. By comparing the DNA of the two populations, we can see if they're genetically distinct enough to be considered separate species. This method goes beyond physical traits and behaviors to look at the underlying genetics, which is the most accurate way to determine speciation.
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