LIFESCI 1 Chapter 26: CH.26 Reading notes
Document Summary
In this chapter you will learn that four evolutionary processes change allele frequencies in populations by starting with a null hypothesis. In this case, the hardy weinberg principle, which in turn makes five assumptions with respect to a particular gene. Natural selection, genetic drift, gene flow, mutation. Evolution is one of the five key attributes to life. Natural selection is the only one of the four processes that can shift allele frequencies over time, thus causing evolution. The four evolutionary processes: natural selection increases the frequencies of certain alleles the ones that contribute to reproductive success in a particular environment. Natural selection is the only one of the four evolutionary processes that lead to adaptation: genetic drift causes allele frequencies to change randomly. In some cases, drift may cause alleles that decreases fitness to increase in frequency: gene flow occurs when individuals leave one population, join another, and breed.
