483 Lecture Notes - Lecture 9: Introduced Species, Convergent Evolution, Sexual Selection

• School: University of Canberra
• Department: University of Canberra
• Course: 483
• Professor: Katie Cohen

Document Summary

Evolution is a theme that helps to explain everything we know about life. Change over time : life starts out simple and becomes more complex ; change gets introduced into the species and passed down through generations. Example : gira es > use of their long neck to eat from high trees = trait is going to be passed on to the o spring while disuse would make a trait disappear. The origins of species was published in 1859. Descent with modi cation : modern species have descended from ancestral species. Natural selection : the environment acts to select certain traits. Finches living on di erent islands developed di erent beak shapes over time, based on the food sources on the island. O spring with traits better suited to their environment are more likely to survive and reproduce (and passed down their traits).