Warm-up 2/13: •What is Struggle to Survive? •Give an Example. •Why is struggle to survive key to Natural Selection? •Give two examples of Evidence that scientist have to support evolution. (You should have learned some in middle school) Evolution defined… Evolution of a population is due to environment and the interaction of other species Evolution acts on phenotype, not genotype Speed Review: Examples of Evolution Convergent evolution: Organisms with very different ancestors become more alike due to a common environment Ex. fish and whales- compare analogous structures Divergent evolution: populations become more and more dissimilar to adapt to the environment-compare homologous structures Appearance of birds with different sized beaks that are specific for size of bird seed Adaptive radiation Population undergoes divergent evolution until it fills all areas of the environment Co-evolution: as one species evolves another does (parasites and hosts) Chapter 15-2 Evolution defined… Evolution is a process of gradual modifications Darwin called this descent with modification Many animals and plants shared common ancestors and deviated from that common ancestor overtime Organism 1 Ancestor Organism 2 Phylogenesis – the evolutionary development and diversification of a species or group of organisms Phylogenic Tree Fossils Fossils provide geologic evidence of evolution Fossils in older layers are more primitive than those in the upper layers Transitional Species: - Descent with modification states that newer species are modified versions of older species - Fossil record contains the intermediates Anatomy Vestigial organs - a group of organs with no particular use now but may have been useful in ancestors (tailbone coccyx or hip bones in whales) Anatomy cont. Homologous Structures: body parts that are similar in structure may have different functions Indicating at some point way in the past they did the same job and came from a common ancestor Anatomy cont. Analogous Structures: same functions but different development ex. a butterfly wing and a bat wing Indicates that populations evolved to be better suited to the environment Homework Whales in Transition. Chromebook Assignments: Make sure that both Assignments are in Assignment Folder & The survey is completed. Syllabus Scavenger Hunt Peppered Moth Lab Warm-up 2/18 What is the difference between Homologous and Analogous Structures? Which shows divergent evolution and which shows convergent evolution? What is differential reproduction? Make sure to glue Whales in Transition into your notebook. Evidence for Evolution Part b (continuation of Thursday’s notes) Biogeography Certain animals in one location share similar traits (I.E. marsupials in Australia) Embryology Similar likenesses in embryos of organisms is evidence of descent with modification Biological Molecules DNA RNA Proteins Similar proteins means similar DNA The longer it’s been since they shared a common ancestor the more differences in protein Classwork/Homework Evidence for Evolution flipbook. Due Friday We will also have a quiz on Friday.