BIOLOGY 153 Lecture 1: Nat Selection post lab

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silverplatypus695

28 Apr 2016

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Natural selection post lab: both of the islands started with two birds in each beak-size category. The lush island"s large- beak population flourished, increasing to seven, while the medium- and small-beaks decreased to one of each. The difference in the islands, and what caused the differences in population, is the size of the food available: the genetic drift experiment is still natural selection. It gives a more realistic view of what happens when determining the new frequencies of alleles in nature, only if the event is natural; tides, wind, etc. If the event is anthropogenic, then it becomes artificial selection. If the results were randomized under the same conditions regarding food size and climate then the outcome should be very similar to the original. Natural selection is still the main decider in the frequency of beak sizes because the seeds and climate are natural factors.

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23.

Peter and Rosemary Grantâs research on Darwinâs finches demonstrated that dry years on the Galapagos Island Daphne Major favored deep beaks in the medium ground finch (Geospiza fortis) and that very wet years favored narrow beaks. In years that were neither wet nor dry (intermediate years), many different types of foods were available, and birds with intermediate beak sizes were favored. Immediately following an intermediate year, average beak size in G. fortis is expected to be

A) narrower than after a wet year and wider than after a dry year.

B) wider than after a wet year and narrower than after a dry year.

C) the same as after a wet year and wider than after a dry year.

D) the same as after a dry year and narrower than after a wet year.

13.

Select the evidence that would support the hypothesis that peppered moths and industrial melanism are an example of evolution by natural selection. Check all that apply.

A) Different color morphs exist naturally in the peppered moth population.

B) The genetic basis of melanism in peppered moths is unknown.

C) Dark moths are recaptured more in polluted areas than light moths.

D) Birds looking for food often miss moths that are the same color as the mothâs background.

Check all of the statements that are supported by studies of artificial selection.

A) Artificial selection shows that evolutionary change can occur over a short time.

B) Artificial selection shows that natural selection is capable of producing major evolutionary change.

C) Artificial selection occurs when humans selectively breed individuals of a species with desirable traits.

D) Artificial selection results only in minor changes within a species.

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BIOLOGY 153 Lecture 1: Nat Selection post lab

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