Relacionar Columnas Origin and evolution of lifeVersión en línea Theories of evolution por Isabel Pérez Cotorruelo 1 Fixism 2 Neutralism 3 Evolutionary development biology 4 Puntuated equilibrium 5 Endosimbiosis theory 6 Neo-darwinism 7 Lamarckism 8 Darwinism The reasons behind the variation within a species are mutations, genetic recombination and sexual reproduction. Most mutations are neither benefitial nor harmful for the individuals that have them, so natural selection does not affect them. Eukariotic cells originated as a result of two different types of bacteria joining together. Individuals of a species that have more favourable characteristics survive more. The evolutionary process does not always take place in a slow gradual way. Instead in many cases new species are form rapidly. Living things do not change, species always stay the same The necessity creates the organ. The acquired characteristics are transmitted to offsrping. Some genes act as switches for other gene groups during embrionic development.
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