Modern Evolutionary Biology I. Population Genetics II. Genes and Development: "Evo-Devo" III. Species A. Overview.

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Presentation transcript:

Modern Evolutionary Biology I. Population Genetics II. Genes and Development: "Evo-Devo" III. Species A. Overview

Modern Evolutionary Biology I. Population Genetics II. Genes and Development: "Evo-Devo" III. Species and Phylogenies A.Overview B.What is a Species? 1. Morphological species concept: “a species is what a professional taxonomist says it is”

B. What is a Species? 1. Morphological species concept: H. eratoH. melpomene Sibling species Polymorphism Problems…

B. What is a Species? 1. Morphological species concept: 2. Biological species concept: “a group of interbreeding organisms that are reproductively isolated from other such groups” – Ernst Mayr

B. What is a Species? 1. Morphological species concept: 2. Biological species concept: “a group of interbreeding organisms that are reproductively isolated from other such groups” Problems: Asexual species? Fossils? The process of divergence…

B. What is a Species? C. How Does Speciation Occur? Pre-zygotic Isolating MechanismsPost-zygotic Isolating Mechanisms Geographic isolationGenome Incompatibility Temporal IsolationHybrid Sterility Behavioral IsolationLow Hybrid Fitness Mechanical Isolation Chemical Isolation

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 1862 – “Lord Kelvin”1903 – Marie Curie "The discovery of the radio-active elements, which in their disintegration liberate enormous amounts of energy, thus increases the possible limit of the duration of life on this planet, and allows the time claimed by the geologist and biologist for the process of evolution.“ - Rutherford Ernst Rutherford

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks - measure amt of parent and daughter isotopes = total initial parental - with the measureable1/2 life, determine time needed to decay this fraction - K40-Ar40 suppose 1/2 of total is Ar40 = 1.3by (Now, you might say "be real"! How can we measure something that is this slow?) Well, 40 grams of Potassium (K) contains: 6.0 x atoms (Avogadro's number, remember that little chemistry tid-bit?). So, For 1/2 of them to change, that would be: 3.0 x atoms in 1.3 billion years (1.3 x 10 9 ) So, divide 3.0 x by 1.3 x 10 9 = 2.3 X atoms/year. Then, divide 2.3 x by 365 (3.65 x 10 2 ) days per year = 0.62 x atoms per day ( shift decimal = 6.2 x ) Then, divide 6.2 x by 24*60*60 = 86,400 seconds/day: (= 8.64 x 10 4 ) = 0.7 x 10 7 atoms per second 0.7 x 10 7 = 7 x 10 6 = 7 million atoms changing from Potassium to Argon every second!!!

Ichthyostega FISH AMPHIBIANS XXX - Struts in the tailfin (FISH) - Feet (AMPHIBIANS) - After fish, before amphibians (just where evolution predicts it should be) IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils a. Ichthyostega and the fish-amphibian transition

D. Devonian ( mya) - Placoderms - Sharks - Lobe-finned Fishes 385 mya 365 mya

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils a. Ichthyostega and the fish-amphibian transition

Eusthenopteron

Tiktaalik roseae

Acanthostega gunnari

Ichthyostega sp.

Archeopteryx lithographica REPTILES BIRDS XXX – 150 mya - Fingers, teeth, tail (Reptiles) - Feathers (birds) - After reptiles, before birds (just where evolution predicts it should be) IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds Epidipteryx – 165 mya

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds Microraptor – 120 mya

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds Anchiornis – 160mya

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds Sinosauropteryx – 120mya

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils b. The evolution of birds Tianyulong – 200 mya

Therapsids REPTILES MAMMALS XXX - Mammalian skeleton - Intermediate ear - primitive dentition - After reptiles, before mammals (just where evolution predicts it should be) IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils c. The evolution of mammals

Mammals from the Jurassic (185 mya) Pelycosaur Reptiles of the Carboniferous (300 mya) Therapsids from the Permian (280 mya) to the Triassic (200mya)

Australopithecines APES HUMANS XXX - After apes, before humans (just where evolution predicts it should be) - bipedal (human trait) - chimp-sized cranial volume IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

Australopithecines Australopithecus afarensis IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

Teeth IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

Legs IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

Skulls IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils d. The evolution of humans

IV. Reconstructing Phylogenies A. Fossil Evidence 1. Radioactive Decay and Geological Clocks 2. Transitional Fossils e. Summary After 150 years of paleontology in the Darwinian age, we have remarkably good transitional sequences that link all major groups of vertebrates. This solves Darwin’s dilemma – sequences of intermediates DO exist – and we have found many of them, even though fossilization is a rare event.