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Darwin Vs. Lamark

by: Grace Elite Notetaker

Darwin Vs. Lamark IFS2087

Grace Elite Notetaker
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About this Document

A way to help yourself better understand Darwin and Lamark's concepts and how they differ.
Trilobites to T. rex: History of Life on Earth
Dr. William Parker
Class Notes
Dinosaurs, darwin




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This 3 page Class Notes was uploaded by Grace Elite Notetaker on Saturday January 9, 2016. The Class Notes belongs to IFS2087 at Florida State University taught by Dr. William Parker in Fall 2015. Since its upload, it has received 95 views. For similar materials see Trilobites to T. rex: History of Life on Earth in Liberal Arts at Florida State University.

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Date Created: 01/09/16
Darwin Vs. Lamark • BOTH o Both thought that life had changed gradually over time and was still changing, that living things change to be better suited and adapted to their environments, and that all organisms are related. • BASIC DIFFERENCE o The BASIC DIFFERENCE between Lamarckism and Darwinism is that Lamarck proposed that adaptations were acquired because organisms needed them, whereas Darwinism states that the adaptations developed by chance through mutations and selection takes place by natural selection. In a sense, natural selection becomes the driving force for change. • LAMARK o is best known for his Theory of Inheritance of Acquired Characteristics § If an organism changes during life in order to adapt to its environment, those changes are passed on to its offspring. § Change is made by what the organisms want or need. § Population of individuals all of the same kind (identical characteristics in all members). Individuals capable of transformation. § For example, Lamarck believed that elephants all used to have short trunks. When there was no food or water that they could reach with their short trunks, they stretched their trunks to reach the water and branches, and their offspring inherited long trunks. § Lamark also said that body parts that are not being used, such as the human appendix and little toes are gradually disappearing. Eventually, people will be born without these parts. • DARWIN o Natural Selection § Darwin believed that the desires of animals have nothing to do with how they evolve, and that changes in an organism during its life do not affect the evolution of the species. § Darwin said that organisms, even of the same species, are all different and that those with variations that help them to survive in their environments survive and have more offspring. § The offspring are born with their parents' helpful traits, and as they reproduce, individuals with that trait make up more of the population. Other individuals, that are not so well adapted, die off. (Natural selection/survival of the fittest) § For example, Most elephants used to have short trunks, but some had longer trunks. When there was no food or water that they could reach with their short trunks, the ones with short trunks died off, and the ones with long trunks survived and reproduced. Eventually, all of the elephants had long trunks. Example Question: How would faster horses develop? • DARWIN HORSES: Faster horses would develop because the fastest horses would survive and mate with each other while the slower ones die off. So basically mating two fast horses would develop faster horses. • LAMARK HORSES: Train horses to run fast and let them mate. The offspring are fast because their parents became fast after being trained. References: -teacher-sheets/lamarck-and-darwin-summary- theories/ -between-darwinism- and.html#.VpF2b9BD3ww


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