1) The yellow-rumped warbler was formerly split into two species (myrtle and Audubon's warblers), but in 1973 it was reclassified as a single species

1) The yellow-rumped warbler was formerly split into two species (myrtle and Audubon's warblers), but in 1973 it was reclassified as a single species. “Myrtle” and “Audubon's” warblers have largely allopatric ranges but hybridize where they are sympatric in the Canadian Rockies. They are similar in appearance but are readily distinguished by experienced birders. What further data about these two forms should ornithologists collect and analyze in order to decide whether they should continue to be classified as a single species? 2. Suppose that members of two populations are separated by a geographic barrier and begin to diverge genetically. Many generations later, when the barrier is removed, the two populations can interbreed, but the hybrid offspring do not survive and reproduce well. Explain how natural selection might lead to the evolution of more effective prezygotic barriers in these species. 3. Discuss the application of the parsimony principle in the construction of phylogenetic trees. 4. Match the following statement/description with the correct term. Terms may be used more than once. Group of answer choices: Vitamin D less folate melanin more -As people moved to areas farther from the equator with lower UV levels, natural selection favored lighter skin which allowed UV rays to penetrate and produce essential -Individuals with dark skin pigmentation have _________ melanin when compared to individuals with light skin pigmentation. -UV light can break down -Individuals who eat lots of fish are typically not deficient in 5. It was once thought that Neanderthals and Homo sapiens had never interbred, but this finding was later reversed. Why did we initially believe there was no interbreeding, and what discovery changed this viewpoint?