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What body part of the Galapogos finches appears to have modified by natural selection?
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∙ 12y ago
The finches beaks were modified by natural selection. The beak size and shape varied from island to island.
Wiki User
∙ 12y ago
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How did the finches help Darwin to formulate his theory of natural selection and evolution?
There were many islands and finches on each. The finches did not fly from their home island to other islands. Different islands had different food for the finches. Darwin noticed that where there were plenty of honeysuckle flowers for the birds to feed on, the finches there had long beaks. On islands where the best bird-food was small seeds, the finches had beaks more like canary beaks, short and strong. Darwin also noticed that the finches were all from the same original flock and had probably mixed up when the islands were closer together and they could fly to any island to feed. So Darwin concluded that when the finches became isolated on different islands, their beaks evolved to be most suitable for eating the food available. The birds with the wrong beaks died young and had few chicks and these chicks unfortunately for them inherited their parents silly beaks. The birds with the right beaks fed well and had lots of chicks who inherited good beaks. So eventually nearly all the finches on any given island had the most suitably shaped beaks.
Why would a finch population that lives on an island have a higher rate of speciation that a finch population that lived in a large forest in north America?
A finch population on an island is more isolated than Êa finch population in a large forest. ÊThe gene pool of the island population would be more limited than the genetic possibilities of the finch population in the forest. ÊThe island finches would be more likely to pass on specialized genes than the forest finches. the island finches have more spatial isolation the island finches have more geographical isolation
The different tools used during the beaks of finches lab represented?
1. Feeding adaptations in finches
What was the effect of natural selection on beak size in the Grants' study?
The Grants studied finches on the Galapagos islands for many years, focusing on the effect of types of food on the size and shape of the finches' beaks. The finches had speciated based on the foods they found available, with some species feeding on large seeds, some on small seeds, and some on other foods. In years with drought in which some foods were scarce, they found that different beak sizes were advantageous than in a wetter year, causing a change in the average beak size seen in the populations. This is important because it is an example of natural selection occurring on a scale that we can easily observe.
What is the shortest period in which a population of Darwin's finches can evolve?
2 years...After a huge drought, the bigger beaked finches lived and the smaller ones died. So two years later finches har beaks that were kind of bigger.
What body part of the Galapogus finches appears to been most mosified by natural selection?
The finches beak!!!
What feature of Galapagos finches was important to Darwin in developing his theory of natural selection?
He noticed that there were different species of finches.
The different species of finches on the galapagos island are believed to have arisen as a result of natural selection acting on populations of finches that had experienced?
Evolution
What are Darwin's finches a great example of?
Adaptive Radiation or Natural Selection (:
Research on Galapagos finches by Peter and Rosemary Grant showed type of natural selection is called what?
Directional Selection
How finches adapted different beak sizes on the galapagos islands?
natural selection
The similarities in the Galapagos finches implied?
The Galapagos finches only exist on the islands and inspired Charles Darwin. They implied that evolution occurs through natural selection.
Relate natural selection to the beak sizes of finches?
The numbers of birds with different beak shapes are changed by natural selection in response to the available food suply.
Which 2 scientist demonstrated that natural selection is still at work in the evolution of finches?
Rosemary and Peter Grant.
What did Darwin hypothesized about the different finches on the Galapagos islands all had a what?
they all evolved from one finch by natural selection.
In Rosemary and Peter Grant's study of the Galapsgos finches what process was encouraged by ecological competition during the dry season?
Directional selection
During breeding season one should expect female house finches to prefer to mate with males with the brightest red feathers Which of the following is true of this situation?
Mate Choice, Sexual Selection, and Intersexual Selection.
