Lecture 3-4-Mutations.post

Lecture 3-4-Mutations.post - Natural Selection Evolutionary...

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Unformatted text preview: Natural Selection Evolutionary Analysis: 1, 3, 5 Elements of Ecology: Chapter 5 Darwin 18593 important principles: Species are related by evolution, branching from common descent Species change through time, they arent static Species are variable Heredity Charles Darwin did not understand heredity (used variation) Heredity Charles Darwin did not understand heredity (used variation) Gregor Mendel (1822-1884)-- genetics of inheritance Heredity Charles Darwin did not understand heredity (used variation) Gregor Mendel (1822-1884)-- genetics of inheritance Importance of Mendels work not understood until years after his death Darwin: Did not understand how variability was generated (mutation) Darwin: Did not understand how variability was generated (mutation) Did not know how variations are passed to offspring Thought that traits blend (But phenotypes may blend; genotypes dont) The Modern Synthesis Darwins ideas disputed for many years The Modern Synthesis Darwins ideas disputed for many years Between 1932-1953, genetics were incorporated with Darwins ideas The Modern Synthesis Darwins ideas disputed for many years Between 1932-1953, genetics were incorporated with Darwins ideas Theory of Evolution is re-stated as the Modern Synthesis (Evolutionary Synthesis) The Modern Synthesis Gradual evolution = result of small genetic changes acted on by natural selection The Modern Synthesis Gradual evolution = result of small genetic changes acted on by natural selection Origin of species (macro-evolution) can be explained via natural selection on individuals (micro-evolution) The Modern Synthesis Restating Darwins original ideas: Mutation creates new alleles; shuffling leads to variation within a population The Modern Synthesis Restating Darwins original ideas: Mutation creates new alleles; shuffling leads to variation within a population Alleles are passed to offspring The Modern Synthesis Some individuals are more successful than others The Modern Synthesis Some individuals are more successful than others Individuals that survive and reproduce are those best adapted to environment The Modern Synthesis Some individuals are more successful than others Individuals that survive and reproduce are those best adapted to environment Over time, these adaptive alleles will become more frequent in the population How does evolution work? Evolutionary processes tend to be invisible We see the products of evolution, not the process Natural Selection Darwin used natural selection to explain adaptation process Lacked examples of natural selection Used examples of artificial selection in plants and animals Natural Selection Individuals in a population vary Natural Selection Individuals in a population vary Variations are heritable Natural Selection Some variants survive and reproduce better than others Individuals with the best variations (adaptations) are selected Natural Selection...
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Lecture 3-4-Mutations.post - Natural Selection Evolutionary...

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