PPT-Big Idea 1 Change in the genetic makeup of a population over time is evolution

Topics covered here Evolution Classification Natural Selection is a major mechanism of evolution According to Darwins theory of natural selection competition for limited resources results in differential survival Individuals with more . Evolution can only occur when there is a change in the gene frequency within a population. . Gene . frequency is a term from the genetics unit and refers to the occurrence of a gene or allele within a population. . (Processes + Patterns of Evolution). Evolutionary Change via Selection . . Types of selective pressures may result from: . i.e. climate conditions, food availability, predators, and choice of mate etc.. process. Written in the genetic code of species alive today. Story of life on earth is the story of the molecule of life---DNA---and the various ways in which it manifests itself, in the form of living species in order to survive. Individuals do not evolve, populations do…Darwin. Lynn English High School Science. Biology/Ms. Mezzetti. Population Genetics and Speciation. Genetic Equilibrium. Genetic Variation. Population genetics is the study of evolution from a genetic point of view. History of Evolution. The evolution of life is linked to the physical and chemical evolution of the earth.. Life on earth evolved in two phases over the past 4.7 -4.8 billion years. Chemical evolution (1 billion years) of the organic molecules and systems of chemical reactions needed to form the first proto-cells.. -- biological evolution: the process whereby earth’s life changes over time through changes in the genetic characteristics of populations . -- theory of evolution: all species descended from earlier, ancestral species . Recent Evolution in Humans. Evolution is very much still happening today — and it's happening to us.. Right here, right now.. Our genes constantly change over time thanks to the power of selection.. Early atmosphere, evidence, natural selection and disease agents influence natural selection. . Introduction . Evolution “ simple” definition: change over time. Evolution helps us to understand the history of life.. Module 14 . The . Biodiversity of Earth. After reading this module you should be able to. understand . how we estimate the number of species living on Earth.. quantify . biodiversity.. describe . patterns of relatedness among species using a . Change in . allele frequencies . in a population over generations. Microevolution. Speciation. = origin of species. Microevolution. : changes . in allele frequencies within . a single gene pool. Macroevolution. Chapter 17: Processes of Evolution. Early Beliefs. 19. th. century: discovered species shared many traits, but lived in different parts of the world. Problematic – species only looked similar on the outside, but inside were very different . Evolution 9/11. Obj. TSW learn form mistakes made on the quiz, and take notes about evolution after the Environmental Science Current Events. P. 34NB. Make a food chain for the following organisms showing the energy arrows and the . Origins of Life on Earth. 4.7-4.8 Billion Year History. Evidence from chemical analysis and measurements of radioactive elements in primitive rocks and fossils. . Life developed over two main phases:. POPULATION change . over time. . Natural Selection. Definition: The process whereby organisms . better adapted to their environment . tend to survive and produce more offspring. . Adaptation. A change or process of change by which an organism or species becomes .