GE CLST 70B Lecture 7: GE70B Lecture 7

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cerisezebra402

8 Feb 2017

School

UCLA

Department

General Education Clusters

Course

GE CLST 70B

Professor

Dr.Anthony Friscia, Dr.Ryan Ellingson

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Document Summary

The grant"s have been measuring finches on the galapagos for decades (multiple generations) Drought hit in 1977, only large seeds available. During industrial revolution, pollution killed light lichens that grew on trees + soot blackened the trunks. Selected for darker peppered moths bc now they blended in better. Bernard kettlewell tested + confirmed this hypothesis experimentally. Reverse happened after the uk passed a clean air act. Similar change found in michigan moths after the us passes a clean air act. Individuals vary: moths vary in color pattern: more individuals produced than can survive: predation, variation influences survival and reproduction: darker or lighter color is less preyed on than the opposite phenotype, variation in features is heritable: yes. Constraints imposed by phylogenetic history: evolution builds on what"s there, some traits are just adequate Selection can"t act on traits that appear post-reproductively: deleterious genes have already been passed on.

Related Questions

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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GE CLST 70B Lecture 7: GE70B Lecture 7

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