<ul><li>Organisms evolve in order to better suit an environment. Evolution involves mutations in the genetic information of organisms that lead to changes in the appearance or phenotype of organisms. Factors from the environment that influence survival, such as availability of food, water and shelter, generate random mutations in organisms. Many mutations are neutral; they have no effect on the organism’s phenotype. Some mutations are detrimental and make the organism less likely to survive. If an organism develops a detrimental mutation, it will not have offspring and so the detrimental mutation will not be passed down. If an organism has a beneficial mutation, its offspring will have that beneficial mutation and will be better able to survive and reproduce. This process of random mutation and selection from the environment insures that organisms advance to more and more complex levels of biological structure. </li></ul>
Two Opposing Theories <ul><li>Multiregional Theory </li></ul><ul><ul><li>Parallel evolution </li></ul></ul><ul><li>Displacement Theory </li></ul><ul><ul><li>Out of Africa theory </li></ul></ul>http://news.bbc.co.uk/
SNP For each individual they analysed half a million SNPs, and then amalgamated the results mathematically to produce two numbers representing that person. This allowed each individual's genome to be shown as a point on a two-dimensional plot: the bigger the differences in the genomes, the greater the distance between them on the plot.
Fig. 23-5 Porcupine herd Porcupine herd range Beaufort Sea NORTHWEST TERRITORIES MAP AREA ALASKA CANADA Fortymile herd range Fortymile herd ALASKA YUKON
Fig. 23-6 Frequencies of alleles Alleles in the population Gametes produced Each egg: Each sperm: 80% chance 80% chance 20% chance 20% chance q = frequency of p = frequency of C R allele = 0.8 C W allele = 0.2