Question

Evolution refers a change in the gene frequency of a population. For example, suppose that in a certain human population in 1990, 65% of the eye color genes were for blue eyes and 35% were for brown eyes. In 2000, the number of blue eye genes was 67%. This small evolutionary change may not be noticeable, but over time, small differences accumulate to produce larger differences. A number of natural phenomena can act to change gene frequencies. Organisms moving into or out of a population (migration) can cause gene frequencies to change. Random fluctuations can also cause changes, particularly i