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EVOLUTION - extinctions Microevolution – A change in a...

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EVOLUTION Natural Selection – Differential success in reproduction by different phenotypes resulting from interactions with the environment. Evolution occurs when natural selection produces changes in the relative frequency of alleles in a population’s gene pool. Allele – An alternative form of a gene. Artificial selection - Selective breeding of domesticated plants and animals to promote the occurrence of desirable inherited traits in offspring. Domesticated Food source Cows, sheep, pigs, goats, etc. Corn, wheat, rice, apples, oranges, pears, peaches, tomatoes, etc. Domesticated Amusement Dogs, Cats, Horses, Turtles But is it any less of a selective pressure? Summarizes Darwin’s Theory The diverse forms of life have arisen by descent with modification from ancestral species, The mechanism of modification has been natural selection working over enormous spans of time. Macroevolution – Evolutionary change on a grand scale, encompassing the origin of new taxonomic groups, evolution trends, adaptive radiation, and
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Unformatted text preview: extinctions. Microevolution – A change in a population’s gene pool over a succession of generations; evolutionary changes in species over relatively brief periods of time. Gene Pool – All the genes in a population at any one time. Are there artifacts of animals and plants that resemble present day animals? Paleontology – the study of the ancient; the study of fossils. Fossil – from the Latin, fossilis , meaning dig up. Fossil Record – the ordered array in which fossils appear within layers ( strata ) of sedimentary rocks. Observation from geology is that the top layers of sedimentary rock represent the youngest deposits, while the deeper layers represent the oldest. Geologies can determine the age of the rock by chemical means. Assumption that if an artifact is found in an undisturbed layer that artifact will have the same age as the sedimentary layer. Caution – One fossil does not a theory make....
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EVOLUTION - extinctions Microevolution – A change in a...

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