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Transcript
Cornell Notes: Mechanisms of Evolution \ Main Idea Details Evolution can be defined as Evolution A gene pool is 5 factors can affect the frequency a gene is found in the gene pool 1. Genetic Mutations are changes in DNA that happen due to errors in The source of all new genes/traits in a population 2. Natural Selection is also known as survival of the fittest It is the driving force of evolution and happens when Genetic drift is a random change in the frequency of alleles in a population 3. Small Populations are VERY VERY affected by genetic drift. Examples of genetic drift: A) Bottleneck effect A) Founder effect 4. Non-random mating means that mates are chosen based on certain characteristics (example, peacock tails). This limits the size of the gene pool because Cornell Notes Page 2 Main Idea Details A decrease in the size of the gene pool increases the speed of evolution 5. Gene flow is the movement of genes into or out of a population This happens because of A) Emigration B) Immigration Examples: 1. Amish people are required to marry and have children with other Amish people 2. Northern elephant seals were hunted almost to extinction by people in the 1890s 3. A lioness joins a new pride and has cubs Reflect In your own words and in complete sentences, compare and contrast natural selection with bottleneck effect.
