BIOL 304 1st EditionExam # 1 Study Guide Lecture 1 (January 21)Chapter 1What is evolution?-Genetic change over time-May or may not involve o Speciationo Long periods of timeo Drastic morphological changesWhy study evolution – why is it important to me?-Evolving diseases-Evolving weeds-Evolving insects-Helps us find natural products we need such as pharmaceuticals-Helps us understand ecology, morphology, anatomy, and behavior-Helps us plan for the futureHIV- Why have treatments been ineffective?- Are humans evolving to fight HIV?- Where did it come from?- Why is it lethal?Lecture 2 (January 23) ATZ resistance- Enzymes do not bind to ATZ- Enzymes binds, but the HIV later fixesOne reason HIV prevails – reverse transcriptase is sloppy- Fights drugs- Mutations take over and drugs cannot stop them- Eventually ATZ stops working- Resistance to drugs is passed on to new virus in human body- The same thing happens to bacteria to antibiotics.HAART- Antiviral therapy- Cock tail of drugs to stop HIV at different levels of development - Evolution against all drugs is highly unlikely if taken properly Are we evolving due to HIV?- Some are more resistant from mutation of an allele - This appears in N. Europeans why?o Black plague?o Random genetic drift?Where did HIV come from?- not monophyletic group- evolved from non-human, primate host1. humans kill infected chips2. people carry virus to populated areas3. people travel around the world- clock origin 1920-1940Why is it lethal?Lecture 3 (January 26)A virus evolve with each individual host and it evolves faster than our immune system can handleWhat factors affect us from defeating HIV virus?- Evolution of the virus- Sloppy DNA replication- Resistance to drugs- Evolution of humans- Allele in Europe that resists HIV- Protein that blocks HIV replicationChapter 2Before 1700’s most biologists believed animals were unchanging Most geologists used a biblical flood to explain rock layers and fossilsArch bishop James Ussher - dated Earth October 22, 4004 B.C.Carolus Linnaeus – binomial naming system James Hutton – uniformitarianism Most geologists gave up on “young earth 4004 B.C.” and some biologists say animals evolved before 4004 B.C.Erasmus Darwin – “E Conchis Omnia” every thing from shells. Thought living things changed from simple to complexJB Lamark – species change over time, from imperfect to perfect. This change was caused by needs. Also proposed spontaneous generationCharles Darwin – - From a wealthy English family- Dropped out of college- Went on the voyage of the Beagle (1831-1836)- Sorted and identified things found from tripo Made puzzling connections – Galapagos fincheso Married Emma Wedgwood (cousin)o By 1838 he realized natural selectionThomas Mathus – unchecked reproduction = exponential growth – diseases and death.Charles Lyell – “principles of geology” and “evidence of antiquity of man”Alfred Wallace – independently developed natural selection, and survival of the fittestAlfred and Darwin co-authored EvolutionDarwin later expanded with “origin of species” Lecture 4 (January 28)Post Darwin- Evolutionary biology has developed immensely since Darwin’s work- “modern synthesis” is 20th century interrogation of his work.Evidence of evolution- Change through timeo Selective breedingo Measuring change in natural populationo Vestigial structures Pseudogenes – nonfunctional In order for it to be a vestigial character, there must be an ancestor that would suggest the use/function Transitional forms- Speciation- Macroevolution- Common ancestryo Homology Different taxa have similar structures only modified Not all similarities are homologous! o Morphologyo Molecular data- Old EarthLecture 5 (January 30)(from previous class)- Old Eartho Modern estimates – 4.6 billion years agoo Oldest rock – 4.2 billion YAo Radiometric datingo Fossil recordo stratographicRadiometric - Alpha particle (protons)- Beta particles (fast electrons)- Gamma Rays (high frequency)Stratographic- Principle of super positiono Younger rocks are on top of older rocks unless disturbedo Lay horizontallyo Cross cutting relationships Intrusion is younger than sedimentary rock Faults are younger than rocks on top of them Principle of fossil succession- Fossils occur in consistent vertical order throughout the worldLecture 6 (February 2)Chapter 3Natural selection Artificial works the same as natural selectionArtificial selection Selective breeding by humans Rely on pre-existing genetic variation in natural populationHow long does it take to change?Conclusion Large morphological changes can occur in short time All natural populations contain genetic variation - potential for evolutionNatural selection Organisms more suited for environment will survive/reproduce – passing traits to next generation Or Organisms with highest “fitness” will pass genes to next generation Fitness relative reproductive success o Survival doesn’t increase fitness unless it increases productiono Only meaningful within context of relative differences.How do we measure fitness?Darwin’s theory of natural selection is testable Individuals within a population are variable Variations are at least partly genetic Individuals vary in reproductive success Success is not random Fitness is in the individualLecture 7 (February 4) Can evolution make new traits? New genotypes via independent assortment and crossing over Genetic mutation can occur during meiosisIs evolution working toward perfection? Compromises between opposing selective forcesNew traits from old Carnivorous plants: turning defective traits into offensive ones. Sticky tape like surface came from plants defensive traitsEvolution of Darwinism Evolutionary biology changes just like everything else Darwin was not infallible We have been building on his ideas for 150 yearsModern synthesis Evolution from small genetic changes in population due to natural selection/ genetic drift Macroevolution – speciation and diversification of taxa is from accumulation of micro evolutionary change Genetic mutations generate new alleles randomly over time Alleles passed from parent to offspring Some alleles confer fitness differences and these will increase in populationRead 3.7 and review how to read a phylogenetic treeLecture 8 (February 6)Chapter 4Phylogenetic trees - Polytomies- o Soft – uncertaintyo
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