BIO120H1 Lecture Notes - Lecture 8: Selective Breeding, Experimental Evolution, Directional Selection
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BIO120H1 Full Course Notes
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Document Summary
Long floral tube pollinated by night-flying moth with exceptionally long proboscis. Relative genetic contribution od individuals to next generation as a result of differences in and fertility. Some individuals better adapted to the environment and thus have higher fitness. Any trait that contributes to fitness by making an organism better able to survive or repro a given environment (noun) The evolutionary process that leads to the origin and maintenance of such traits (verb) No purpose or gain; simply a blind mechanistic process with no foresight. Today hundreds of measurements of selection demonstrating fitness differences & evolu change in traits. Fewer convincing cases that demonstrate the mechanisms (agents) of selection in natura populations. Alleles conferring cyanide resistance are found at low frequency in populations. Resistance spreads through the population when selection is imposed by cyanide fumigat this process serves as model for the evolution of many forms of resistance e. g. antibiotics insecticides, herbicides. Evolution of industrial melanism in the peppered moth.
