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A graph of the sizes of the Medium Ground Finch beaks throughout the drought.

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Here are the sizes of the Medium Ground Finch beaks throughout the drought.

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The majority of the Medium Ground Finches with small beaks died out because they couldn't eat their food. It was no longer growing due to the drought.This means that the big-beaked finches reproduced more than the few small-beaked birds left. This is why there are more big-beaked Medium Ground Finches than small beaked Medium Ground Finches on Daphne Major.

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According to Which Mechanism of Microevolution Caused the Beak of the Medium Ground Finch Population on Daphne Major to Increase in Size From 1976 to 1978 Page 2, Natural Selection is when the frequency of a gene reflects the traits and genes of the individuals that were able to survive long enough to reproduce in the previous generation.

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There was more large- beaked finches to mate with on Daphne Major.The large beak trait was passed down more than the small beak trait. Since the small-beaked finches died out, the majority of the birds mating with each other had large beaks.

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The average beak length in 1976 was around 10.7 millimeters and the depth was around 9.7 millimeters. In 1978 the average beak length was 11.6 millimeters and the average depth was 10.6. Although there was a bit of an increase in beak sizes between the years, other characteristics of the bird stayed very similar. Since the drought didn't affect the wing size, the average wing size in 1976 was 65 millimeters and the average wing size in 1978 was around 65.5 millimeters. This data was found in the Lab 18 Finch Data sheet.

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Since the Portulaca seeds are now 0 per square mile (according to page four of Which Mechanism of Microevolution Caused the Beak of the Medium Ground Finch Population on Daphne Major to Increase in Size From 1976 to 1978 ), the small/thin beaked birds died out. Causing there to be more large beaked birds on Daphne Major.

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The Portulaca seeds (the soft seeds) could not grow due to a drought on Daphne Major.The small/thin beaked birds eat these soft seeds.

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The reason the beak of the Medium Ground Finch population increased in size is Natural Selection.