Descent with Modification Chapter 22 A Darwinian View of Life- 1. challenged---a young Earth inhabited by unchanging species

Objective Describe a typical sequence of events of fossilization. What is the main mistake usually made in movies about the earliest Earth history?

History of Biological Diversity Scientific Inquiry: led to the theory of evolution by natural selection. Diversity : concepts of genetics-phylogeny Energy: organisms used in metabolism from 1 st cell until today. Homeostasis: populations and communities might develop adaptation due to long-term disruptions.

Change: natural selection results in long- term change, or evolution, of populations to produce new species. 429-Hutton, Malthus, Lamarck, Lyell, Darwin, Wallace-theory, The Origin of Species-1859, Mendell-1865.

Fossilization- Categories Trace fossils-indirect evidence left by Molds and casts- impression of an organism Replacement- remains are replace by minerals Petrified or permineralized empty pore spaces are filled in by minerals. Amber- preserved tree sap traps organism Original material- mummification/ freezing

Lamarck-Acquired Characteristics Concept of use and disuse, idea that those parts of the body used extensively to cope with the environment become larger and stronger; while those not used deteriorate. The inheritance of acquired characteristics to pass on to the offspring.

Darwin’s focus on Adaptation Origin of Species developed two main points: the occurrence of evolution and natural selection as its mechanism. Natural hierarchy of Linnaean scheme: kingdom>phylum>class>order>family> genus>species.

Darwin’s main ideas Natural selection is differential success in reproduction. Occurs through an interaction between the environment and the variability inherent among the individual organisms making up a population. The product is the adaptation of organisms to their environment.

Homologies Homologous structures Vestigial organs Embryological homologies Molecular homologies Homologies and the tree of life

Homework Read Chapter 22---pp Complete questions #1—16. Due Wednesday—material for fossilization and play-doh; questions to share with class. Class will evaluate the quality of the fossil by responding to your questions on Friday.