Answer: -The separation of habitats reduced gene flow between the populations-Genetic drift occurred in the two populations.-Natural selection favored individuals that were more fit in the new environment(Why: Physical isolation natural selection and genetic drift are all events that lead to speciation.)
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Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island?
Darwin's finches (also known as the Galápagos finches) are a group of about 18 species of passerine birds. They are well known for their remarkable diversity in beak form and function. They are often classified as the subfamily Geospizinae or tribe Geospizini. They belong to the tanager family and are not closely related to the true finches. The closest known relative of the Galápagos finches is the South American Tiaris obscurus. They were first collected by Charles Darwin on the Galápagos Islands during the second voyag…
The medium ground finch (Geospiza fortis) is a species of bird in the family Thraupidae.It is endemic to the Galapagos Islands .Its primary natural habitat is tropical shrubland.One of Darwin's finches the species was the first which scientists have observed evolving in real-time.. The population of medium ground finches has been experiencing inbreeding depression due to small population numbers.
Darwin's finches - Wikipedia
Medium ground finch - Wikipedia
Medium ground finch - Wikipedia
Darwin's finches - Wikipedia
Peter Raymond Grant FRS FRSC...
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