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Download Natural Selection Worksheet - Evolution and more Exercises Evolutionary biology in PDF only on Docsity!
Name: KEY Date: Class: UNIT 4: EVOLUTION TOPIC A: NATURAL SELECTION Essential Idea(s) © The diversity of life has evolved and continues to evolve by natural selection. IB Assessment Statements and Class Objectives: 5.1.U1: Evolution occurs when heritable characteristics of species change. ¢ Define evolution, 5.2.U1: Natural selection can only occur if there is variation among members of the same species. ¢ Define variation. e Explain why natural selection can only function if there is variation in a species. 5,.2.U2: Mutation, meiosis and sexual reproduction cause variation between individuals in a species. e List sources of genetic variation. 5.2.U6: Individuals that reproduce pass on characteristics to their offspring. e Contrast acquired characteristics with inheritable characteristics. e Explain why only inherited characteristics can be acted upon by natural selection. 5.2.U4: Species tend to produce more offspring than the environment can support. e State that species have the ability to produce more offspring than the environment can support. e Use an example to illustrate the potential for overproduction of offspring in a population. 5,.2.U5: Individuals that are better adapted tend to survive and produce more offspring while the less well adapted tend to die or produce fewer offspring. e Outline how a “selective pressure” acts on the variation in a population. e List examples of “selective pressures.” e Explain the effect of selective pressures on more and less adapted individuals in a population. 5.2.U3: Adaptations are characteristics that make an individual suited to its environment and way of life. e Define adaptation. e List 3 examples of adaptations. 5.2.U7: Natural selection increases the frequency of characteristics that make individuals better adapted and decreases the frequency of other characteristics leading to changes within the species. e Compare the reproductive success of better and less well adapted individuals in a population. e Explain the cause of the change in frequency of traits in a population through natural selection. 5.1.A2: Development of melanistic insects in polluted areas. e Explain how natural selection leads to changes in the melanistic variety of insects in polluted areas. EVYOLUTION- prpenss by which different Kinds of living Orgonisms are thought to have oleveloped + diversified from earlier forms during the history of the earth VARIATION- any difference between Cells, organisms, or groups OF organisms of anu species case 3 genehe diftlerte < ’ by 
