GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The finch populations were very numerous, and different species often bred with one another.
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The finch species lived in different habitats on different islands, which isolated them from one another.
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The finch species were distributed evenly among all of the islands, but did not interbreed.
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The beaks of the finches were identical, allowing them to eat the same foods on any of the islands.
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Detailed explanation-1: -Later, Darwin concluded that several birds from one species of finch had probably been blown by storm or otherwise separated to each of the islands from one island or from the mainland. The finches had to adapt to their new environments and food sources. They gradually evolved into different species.
Detailed explanation-2: -It is thought that their ancestor, and closest known relative, is the dull-coloured grassquit, which is found on mainland South America. Once the original grassquits arrived at Galapagos, they diversified and adapted to the different environments found on the Islands, eventually becoming different species.
Detailed explanation-3: -How did Darwin explain why the finches on the Galapagos Islands look so similar to each other except for their beaks? The finches all have a recent common ancestor but they evolved on different islands where different types of food are available.