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Lecture_3_-_Evo_1 - Common ancestry Not teleological Thomas...

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The HMS Beagle 1831-1836
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Adaptive radiation : The diversification of one founding species into multiple species that exploit different habitats
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Darwin’s Theory of Natural Selection (explanation for the mechanism of change) Variation within a population Differential fitness Competition for limited resources (struggle for existence) Environmental context Inheritance
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Fitness 1. Differential survival 2. Differential reproduction determine…… Fitness: Individual’s genetic contribution to the next generation
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1859 Publishes “Abstract”
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Alfred Russel Wallace
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Evidence for Evolution 1. Artificial Selection (Domestication)
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2. Geographic Distribution (Biogeography)
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3. Paleontology
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4. Comparative Anatomy
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5. Embryology
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Examples Industrial Melanism Antibiotic resistance
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Implications of Natural Selection Species change over time Adapt to environmental pressures
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Unformatted text preview: Common ancestry Not teleological Thomas Henry Huxley The Remaining Questions How does inheritance work? Where does variation come from? Gregor Mendel mid to late 1800’s Mendel’s Pea Experiments Mendel’s Discoveries Particles of inheritance Each trait is determined by two particles – one from each parent Some particles are dominant , others are recessive “Mom” “Dad” Heterozygous? Homozygous? Mendel’s Principle of Segregation Alleles occur in pairs (two alleles per trait). During gamete production, the alleles separate – each gamete only contains one member of the pair. Gene? Allele? Gamete? Genotype? Phenotype? Mendel’s Law of Independent Assortment The genes controlling different traits are inherited independently of one another. Color Height...
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