UMass Amherst BIOLOGY 280 - Adaptive Evolution (3 pages)

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Adaptive Evolution

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Adaptive Evolution


Darwin's Four Postulates of Evolution, the idea of Natural Selection, and the Grants' Finch experiment.

Lecture number:
Lecture Note
University of Massachusetts Amherst
Biology 280 - Evolution:Diversity of Life-Through Time

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BIO 280 1st Edition Lecture 4 Outline of Last Lecture I The Enlightenment of the 18th Century and major Naturalist Theories a Carolus Linneaus b William Smith c William Paley d Lamarck e Malthus f Lyell II Development of Charles Darwin s Theory a Voyage on the HMS Beagle b Galapagos Islands c Alfred Russell Wallace Outline of Current Lecture II Adaptive evolution a Darwin s Four Postulates of Evolution b Natural Selection Evidence that the Four Postulates are Accurate c The Grants Medium Ground Finch Experiment Witnessing evolution Current Lecture Adaptive evolution Adaptation is a process and a physical trait Natural selection leads to adaptation Darwin s Logic four Postulates of Evolution o 1 Individuals in a population vary o 2 Traits are passed from parents to offspring These first two ideas combine to give us the idea of Heritable variation o 3 Individuals vary in surviving and reproducing This is classified as differential reproductive success o 4 Survival and reproduction are not just due to chance These factors lead to the difference in survival and reproductive chances Heritable variation and reproductive success are correlated o If all these four postulates are accurate than the frequencies of traits will change over generations Adaptive evolution by Natural selection Evidence that these four postulates are accurate These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o From observing the Galapagos finches Darwin recognized that these birds all have a common ancestor of a mainland bird Speciation comes from this common ancestor This leads to the branching out of different physiological features On Daphne Island The Grants observed the Medium Ground Finch over the course of 30 years o Beak depth was widely variable in this population Postulate 1 is observably true o The Grants averaged the beak size of the parents and they averaged the beak size of offspring

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