BISC208 Lecture Notes - Lecture 1: Aequorea Victoria, Allele Frequency, Genotype Frequency
29 Aug 2016
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Document Summary
Fossils are the preserved remains of past life on earth (bones, shells, leaves, impressions, etc. ) Most fossils are found in sedimentary rock (particles of older rocks broken apart by water or wind) where they were buried quickly and their hard parts gradually replaced over millions of years by minerals. Geological processes such as folding can make make lower layers younger. Radiometric dating- analyzing the decay of radioisotopes within rock. Radioisotopes are unstable and decay spontaneously, releasing radiation at a constant rate. Decay is not affected by the environment (press. , temp. , chem. Reactions, ph: living organisms absorb carbon by eating and breathing. Half life is length of time required for a radioisotope to decay to exactly its initial quantity. Carbon-14 nitrogen-14 (works up to 40,000), uranium-235 lead-207. Igneous rock- rock formed through cooling and solidification of rock is commonly used to analyze radioisotope decay.
