AIM: How Do Scientists explain and support the theory of evolution

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Transcripción de la presentación:

AIM: How Do Scientists explain and support the theory of evolution AIM: How Do Scientists explain and support the theory of evolution? Como los cientificos apoyan la teoria de evolucion?

What is a theory?/ Que es una teoria? Is an explanation supported by observations and/or experiments, that can be used to explain related occurrences/ Una explicacion apoyada por experimentos y observaciones Theory of Evolution

Theory of Evolution/ Teoria de Evolucion The process by which species change over time (simple to complex). Present day species are related to ancient species. El proceso por el cual las especies cambian con el tiempo (de estructura simple a compleja). Este cambio (llamado adaptacion) les permite sobrevivir en su medio ambiente. Las especies de hoy en dia están relacionadas con especies antiguas.

Evidence/ Evidencia Fossil Record - collection of fossils that provides clues to the history of Earth’s organisms. The fossil record spans much of geologic time (billions of years of Earth’s history). Registro fósil - colección de fósiles que proporciona pistas a la historia de los organismos de la tierra. El registro fósil abarca gran parte de tiempo geológico (miles de millones de años de historia de la tierra). Similitudes en las estructuras corporales. Similitudes en el desarrollo embrionico. Biologia molecular ADN y proteinas Similarities in Structure (body structures) Similarities in Development (Embryology) Molecular Biology (DNA & Proteins)

How do we know that we have evolved from ancestors distinctly different from us? The fossil record (remains of dead organisms) have given scientists the clues they needed to determine an organisms ancestry by comparing them to present day species. El registro fósil (restos de organismos muertos) han dado a los científicos las pistas que necesitan para determinar una ascendencia de organismos mediante la comparación de especies de hoy en día.

The fossil record shows… Life has evolved from simple to more complex Newer Organisms: more complex Los organismos mas recientes son mas complejos Older Organisms: more simplistic Los organismos mas viejos son mas simples

What do we learn from fossils? http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html How did behaviors evolve? How long did individuals live? How do features evolve over time? Que aprendemos de los fosiles? De donde provienen los comportamientos? Que tiempo vivio esa esa especie? Que caracteristicas han evolucionado a lo largo del tiempo? http://www.ucmp.berkeley.edu/education/explorations/tours/stories/middle/C7a.html

Species living at present time (top) Ancestral common species (bottom) Evolutionary Tree Species living at present time (top) Ancestral common species (bottom)

Similar to a family tree Descendents Descendents Common Ancestor

Our Common Ancestor/ Nuestros antepasados Unicellular Common Ancestor 100’s of Millions of year ago

How closely related are they? Those who have a recent common ancestor (a close point of intersection in a tree diagram) Relacionados aquellos que tienen un antepasado común reciente (un punto cerca de la intersección en un diagrama de árbol) distant Those who have a distant common ancestor (a far point of intersection in a tree diagram) Lejanos aquellos que tienen un antepasado común lejano (un punto lejano de la intersección en un diagrama de árbol)

What organisms are our closest relatives? Why?