BIO 101 Chapter Notes - Chapter 8: Gene Flow, Selective Breeding, Phenotype
4 Mar 2016
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Population- a group of organisms of the same species living in a given area. Evolution- a change in allele frequencies of a population. Start with a cage that contains a large number of fruit flies (5000) and remove the food: testing starvation resistance. Wait until 80% of the flies starve to death, then return the food to the cage. Record the average starvation resistance time: starting a new generation. After the surviving flies eat a bit, collect the eggs those flies lay and transfer them to a new cage. Repeat steps 2 and 3: over many generations of natural selection, the population changes. Originally, the flies couldn"t survive a day without food. The characteristics of the individuals present in a population can change over time. We can observe such change in nature and can even cause it to occur. Traits- any characteristic or feature of an organism.
