The Origin of Species Presentation about the differenttheories which tries to explain this phenomenon
Introduction• There are two big groups in which the origin of species are divided:Non-evolution theories: Creationism and FixismEvolution ones theories: Lamarckism. Darwinism andNeo-Darwinism
Creationism• Creationism is the religious belief that humanity, life, the Earth, and the universe are the creation of a supernatural being, most often referring to the Abrahamic God.
Fixism • They are beliefs that affirm the different species of the planet have remained invariable throughout the time. • All the alive beings were created as we see them at present. The Nature does not change, it was ended and unaltered from his formation.Cuvier thought that Cuvier, to thechanges were produced thelft, andby huge catastrophes; Linneo, to thethis theory is called: right, supported this“Catastrophism” theory
Lamarckism• Living beings are distributes from simple (appeared by spontaneus generation) to more complex ones (by progresive transformations)• Evolution is explained due to the function creates the organ.• Transformations suffered by an organism are transmited by heredity to their offspring A good example are the famous case of the girafe´s neck
Darwinism• Current species are originated by ancient, common ones.• It explains the evolution with the next steps: -Species suffer variations, which can cause advantages or disavantages. -Natural selection will choose the “good” ones and they will be transmited to their offspring.• Darwin know nothing about genetic
Neo Darwinism • It´s the synthesis of: -Genetic discoveries of Mendel, that explains how variations are produced. -Natural selection theory formuled by DarwinMendel rules Natural selection Neo Darwinism