traits The beetles in a different color are an example of evolution, since brown beetles are more common than they used to be and make up 70% of the population. reproductive success Mutation Migration Genetic Drift Natural Selection Makes certain genes for an offspring differ from their parents Organism with a unique gene joins population with much different ones One gene becomes more frequent due to the other dying off. An organism with certain traits will survive to reproduce due to traits that help it survive.
9 . [Click next several times to read about mutations] Now complete the paragraph below regarding gene flow. “Gene flow, also called _________________, is any movement of ______________ from one __________________ to another. Gene flow includes lots of different kinds of events, such as _________________ being blown to a new destination or people moving to new cities or countries. If ______________ are carried to a population where those genes previously did not __________________, ____________________ can be a very important source of genetic ___________________. In the graphic on the website, the gene for _________________ coloration moves from one population to another.” 10 . [Click next and read until you get to Genetic Drift] Summarize the idea behind genetic drift. 11 . [Click next] Natural selection is the most important mechanism behind evolution. This webpage gives you an example of natural selection involving beetles. Read the descriptions and look at the cartoons. Explain what has happened to this population of beetles, using the following terms: Adaptation, Survive, Reproduce, Gene, Natural Selection, Species, and Evolution.