HSCI 100 Chapter Notes -Plants And Animals, Telmatobius, Allele Frequency
13 Aug 2013
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Document Summary
Origin of life through chemical evolution: primitive atmosphere contained gases (h2o, co2, n2) that escaped from volcanoes. Spheres become the first cells (protocells) later protocells became true cells that could reproduce. Biological evolution change in population/species & their alleles over time. Living things descended from a common ancestor and thus, have common chemistry. Natural selection operates on reproductive fitness and success. Next generation is a result of existing variatiability, new mutations, selection and genetic drift. Adaptation: a characteristic that makes an organism survive and reproduce in its own environment. Microevolution: changes in frequency of certain alleles relative to others within gene pool of population. Population: group of individuals of same species living in particular area gene pool: all alleles of all genes of all individuals in a population mutation: change in nucleotide sequence of dna. Genetic drift - allele frequencies within population change randomly because of chance alone.
