During a storm a pair of butterflies is blown onto an island that has never been

Question

During a storm a pair of butterflies is blown onto an island that has never been inhabited by butterflies before. This particular pair of butterflies happened to have a higher frequency of the allele that causes blue-spotted wings. The pair of butterflies mate, and their descendents make up the entire population on the island. Over many generations scientists notice that the blue-spotted butterflies prefer to mate with other blue-spotted butterflies, and also that the frequency of butterflies with blue-spotted wings is higher on the island in comparison to the butterflies found on the mainland. This is an example that illustrates what evolutionary process(es)?

Explanation / Answer

this is deleterious variation and genetic drift. Tentative generalizations about evolutionary processes across species are beginning to emerge, as well as contrasting patterns that characterize different groups of organisms. Furthermore, recent technical advances now allow the combination of ecological measurements of selection in natural environments with population genetic analysis of cloned QTLs, promising advances in identifying the evolutionary processes that influence natural genetic variation.

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