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Transcript
Evolution Chapter 16.1-16.2 I. Introduction A. Evolution – any change in a population over time. 1. Micro – small changes within a species. 2. Macro – change into a new species. I. Introduction (cont.) B. Evolution is a THEORY based on scientific evidence. The basic ideas are: Differences exist within the genes of a population. In an environment, some individuals are better suited to survive and have more offspring. Helpful traits are passed on. Fossil evidence II. Adaptation A. Adaptation – the accumulation of characteristics that improve an organisms ability to survive and reproduce. B. Animals adapt to the demands of their environment. C. Structural Adaptations – bodily characteristics that best suit an organism for survival II. Adaptation (cont.) D. Behavioral Adaptations: organisms behave in a certain way in order to survive in their environment. (example: birds fly south for the winter). III. Natural Selection A. Natural Selection– an attempt to provide an explanation for observations. B. The organisms best suited for the environment will survive and pass on their traits to their offspring. Organisms NOT suited will eventually die off and become extinct.