BIOL 1202 Exam 1

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Tuesday, April 10, y Biology 1202 | Exam 1 Notes  Lecture 1 - Chapter 22 : Descent with Modification: A Darwinian View of Life What is Evolution and Adaptation? -   Evolution : 2 main ideas change over time of the genetic composition of a population decent of modern organisms with modification from preexisting organisms -   Evolutionary Adaptation accumulation of inherited characteristics that enhance organisms’ ability to  survive in specific environments Pre-Darwinian Theory of Evolution - Jean Baptiste Lamarck         Use and disuse - bodies of l iving organisms are modified through the use or disuse of parts ex:  giraffes had shorter necks and legs in the past. Lifetime of stretching  left them with longer legs and necks          Inheritance of acquired characteristics - modifications are inherited by offspri ng  Turned out to be wrong Evolution by Natural Selection - Darwin and Wallace developed the theory independently  1
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Tuesday, April 10, y         Darwin  - voyage of the Beagle - 1830s; Cambridge University. Spent time in South America collecting data  on different organisms. Studied his data  and correlated changes in  organisms and developed theory. Submitted Wallace and his own work.  Published book on the Origin of Species.         Wallace  - naturalist in Indonesia; contracted Malaria and began observing  organisms and published writing on the data he collected. Sent to Darwin. Natural Selection - the unequal survival and reproduction of organisms due to environmental forces,  resulting in the preservation of favorable adaptations  - process  “selects” from what is available in the gene pool - new characterist ics are created on demand  Mechanism behind Natural Selection - Observations 1. Individuals in a population vary in their heritable characteristics  2. organisms produce more offspring than the environment can support         -  Inferences  > individuals that are well suited to their environment tend to leave more  offspring than other individuals and overtime favorable traits accumulate in  population  Variability Heritability Differential reproductive success 2
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Tuesday, April 10, y Lecture 2 I. Artificial Selection A. Selective breeding of organisms to encourage the occurrence of desirable traits B. analogous to natural selection II. Concept 22.3 A. Evolution is supported by an overwhelming amount of scientific evidence  III. Examples of Natural Selection A. Soapberry bug B. Figure 22.13 IV. Within a few weeks of treatment with the drug 3TC, a patients HIV population  consists almost entirely of 3TC-resistant viruses. How?
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