Evolution Continued: Evidence & Other Concepts.
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Paleontologists have long thought that Archaeopteryx fossils, including this one discovered in Germany, placed the dinosaur at the base of the bird evolutionary tree; evidence suggests the beast may have been a birdlike dinosaur.CREDIT: Humboldt Museum fürNaturkunde Berlin
Today, most of the evidence for evolution is grouped into these main categories:
http://en.wikipedia.org/wiki/File:Equine_evolution.jpgThe Evidence of Evolution Use the information on the following slides to complete your “Matching Notes” student sheet.
Dinosaur fossil searcher Ray Stanford discovered a large fossil of a Nodosaur just a few feet from this spot.
Tracy A. Woodward / THE WASHINGTON POSTFossils Cont.
Homologous structures: w/ similar structure, but different function show an evolutionary relationship
Embryos of different species may appear similar in early stages of development
http://www.evolutionnews.org/Mader_2010.jpg4 - Homologies: Developmental (Embryology) Textbook Reference pg. 402
Hox genes:found in animals, determine the pattern of the body during development
http://www.nobelprize.org/nobel_prizes/medicine/laureates/1993/illpres/protmol-aminoacid-v4.gif5 – Homologies: Biochemistry
Textbook Reference pg. 402-403
Sequenceof amino acids in a particular protein is compared between organisms
Some changes in species have been observed and studied inrecent times
Species: a group of organisms that breed with one another and produce fertile offspring
Spotted owl subspecies living in different geographic locations show some genetic and morphological differences.Isolating Mechanism: Reproductive IsolationTextbook Reference pg. 410
http://biology-forums.com/gallery/33_14_07_11_6_00_25.jpegIsolating Mechanism: Geographic Isolation
Photo Credit, Christian Ziegler
Populations may mate or flower at different seasons or different times of day. Three tropical orchid species of the genus Dendrobium each flower for a single day; the flowers open at dawn and wither by nightfall.
BritannicaIsolation Mechanism: Temporal Isolation
Adaptive radiation: type of divergent evolution; ancestral species evolve into an array of species to fit diverse habitats
http://media-1.web.britannica.com/eb-media/11/54911-004-B661673C.jpgTypes of Evolution: Divergent Evolution
Textbook Reference pg. 412-13
Convergent evolution: when unrelated species occupy similar environments, evolving similar traits, but are NOT closely related
http://bio3vo.files.wordpress.com/2011/04/analogous-structures.jpgTypes of Evolution: Convergent Evolution