GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The birds migrated to the island with the right food supply for their beaks.
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The food supply on the islands changed to match the birds’ beaks.
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The predators on the islands eliminated the birds with the “wrong” beaks.
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The birds with the “right” beaks for the food supply had more young.
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Detailed explanation-1: -The birds were believed to have come all from one population, but when separated on the islands with differing habitats, the birds changed. The beaks of the birds on islands with lots of seeds were different from the beaks of the birds on islands with lots of insects.
Detailed explanation-2: -One key observation Darwin made occurred while he was studying the specimens from the Galapagos Islands. He noticed the finches on the island were similar to the finches from the mainland, but each showed certain characteristics that helped them to gather food more easily in their specific habitat.
Detailed explanation-3: -1: Darwin’s Finches: Darwin observed that beak shape varies among finch species. He postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources.
Detailed explanation-4: -Some were small. Each one was suited to the availability of particular foodstuffs. Eventually Darwin theorized that different species of finch had evolved on different islands, their distinctive beaks being an adaptation to distinct natural habitats or environmental niches.
Detailed explanation-5: -However, the Galapagos finches helped Darwin solidify his idea of natural selection. The favorable adaptations of Darwin’s Finches’ beaks were selected for over generations until they all branched out to make new species. These birds, although nearly identical in all other ways to mainland finches, had different beaks.