EBIO 1030 Lecture 13: ebio oct 23 notes
30 Jan 2019
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Document Summary
Evolution- changes over time in a population"s genetic makeup (changes inherited via genes) Modern forms are not present in early fossil record. All species present on earth today are descendants of a single common ancestor and . All species represent the product of millions of years of accumulated micro-evolutionary changes. Living things, through various processes, have been diverging from a common ancestor since life originated. E. g. increase in average dress size in women over the past 50 years. Recombination (new combos of alleles via meiosis and sexual reproduction) Natural selection (non random fixation of alleles that confer an advantage within an ecological context ) Genetic drift (random fixation or loss of alleles in a population) Natural selection- process by which populations adapt to their changing environment. Diff levels of survival and reproduction of individuals in a population. Accumulation of micro evolutionary changes that results in the origin of new species. Occurs slowly over long periods of time.
