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Bio lab 4 notes Nov 20 2009

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Ingrid L.Stefanovic

Bio lab 4 Evolution of heavy metal tolerance The differentiation of populations is considered the first step towards geographic speciation in plants and animals. 3strticles: populations of Agrostis tenuis resistant to lea and zinc posioning 1 , Bradshaw grew plants in soil, Terms:heavy metal J any element that has a atomic number bigger than 20 Tillers J a shoot at the base of a grass plant from which leaves and toor afrom to yield another plant Results J a few plants from the unpolluted site did show tolerance to polluted soil, suggested that even in a normal population, there are potential adaptive variants. but genrally, the unpolluted cannot survive in polluted soil, and the plants from polluted soil cannot grow very well in the local soil neither. Why are metal-tolerance individuals rare in the pasture population? st 1 , could due to the strong natural selection agaist the metal-tolerance 2 , there is a growth or competitive cost to having the physiological mechanisms to tolerate haevy metals. ] o9L ZZ[Z}lK]L]L2ZZ
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