BIO152H5 Lecture Notes - Lecture 12: Melanism, Heterozygote Advantage, Essenes

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erinturtle513

6 Jun 2017

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Heritable variation leads to differential survival and reproduction. Evolution of heavy metal tolerance in plants: soils around mines heavily polluted with heavy metals (ex. copper, lead, nickel, tolerant genotypes (to heavy metals) can survive in polluted soil, intolerant genotypes die off: Result: selected reproductive success: gene flow between uncontaminated grassland and mine restricted. June 1, 2017: genes for tolerance maintained near mines, gene flow between unpolluted field and polluted one often restricted because of evolution of physiological and reproductive isolating mechanisms: may potentially lead to formation of different species. Evolution of herbicide resistance: herbicides kill weeds, weeds become resistant to herbicide, herbicide selects for herbicide-resistant weeds: Originates because of genetic variation we changed the environment and selected for kills off weeds. Causes another insecticide to be used and insects adapt and so on. Transmission of tb occurs through the air, from infected individuals. Discovery of antibiotics revolutionized treatment for tb.

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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BIO152H5 Lecture Notes - Lecture 12: Melanism, Heterozygote Advantage, Essenes

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