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Transcript
Name________________ Where does variation come from? - Guided Notes _____________ are controlled by genes. Individuals within a population are not _____________, there is _______________ or differences within the populations genes. ________________________: process by which organisms with traits best suited to the environment are most likely to survive, reproduce and pass on their genes to next generation. There is a certain amount of genetic __________________ in any population. This is because each individual carries a different set of alleles within their DNA for certain traits. There is an _______________of offspring. Organism usually produce more offspring than can survive. Example: Organisms face a constant struggle to survive; trying to avoid predators and locating enough food. In the __________________ for these resources, some of these individuals survive long enough to pass the alleles for those successful traits on to their offspring. Later generations will have increased numbers of individuals with those alleles/traits. Natural Selection causes a change in ________________ ________________. The environment determines which alleles are favored as species _____________ to their environment and __________________ into new species. What turtle do you think lives on the island with lower vegetation? The _____________________ of individuals may vary from one end of the curve to the other. Natural selection can affect the ____________________ and hence the shape of the bell curve. _______________________ occurs when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end. Stabilizing selection occurs when individuals near the center of the curve have higher fitness than individuals at either end. Draw a graph that represents stabilizing selection. _____________________ occurs when individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle. Conclusion: Evolution is any change in the relative frequency of alleles in the gene pool of a population over time. Natural selection operates on individuals, but resulting changes in allele frequencies show up in populations. Populations, rather than individuals, evolve!!