Darwin’s Finches and Natural Selection Case Study Answers + Evolution – Flashcards
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Limited Gene Flow Means
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Birds rarely move between the mainland and the islands.
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Endemic means
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The species isn't found anywhere else.
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What is the average depth of the finches' beaks in Year 1?
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About 9.5mm
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How much was the biggest difference in beak depth?
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8 mm
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What do you think a graph of population size would look like for Year 1 to Year 3?
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Negative linear line.
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What was the average beak depth in 1978? (Remember that the average beak depth in 1976 was 9.5 mm.)
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Just under 10mm
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Evolution
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A change in the frequency of an allele, such as an allele for beak depth, is the basic definition of evolution.
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Did the finch population evolve from 1976 to 1978?
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Yes
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The Grants saw evolution within...
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A couple of years.
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2 things that surprised the Grants
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1. Evolution could occur quickly enough to observe within a few field seasons.
2. Evolution can occur at very small scales. The Grants' measurements were very careful.
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Natural selection
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_______ does not happen to individuals, but within populations.
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Evolution by Natural Selection
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1. Can not occur without heritability.
2. It is a genetic change through time.
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Grants Study Order
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1. Weather Change
2. Well-adapted (physiological traits) animals leave more
offspring
3. Gene frequencies in the population change
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What occurred between 1976-1978.
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Drought, which caused the finch populations to decline.
