LIFE 102 Lecture Notes - Lecture 50: Brussels Sprout, Star Wars Holiday Special, Broccoli
Document Summary
Descent with modification: a darwinian view of life- *darwin noted that current species are descendants of ancestral species. *evolution can be defined by darwin s phrase descent with modification. *evolution can be viewed as both a pattern and a process. *darwin"s interest in geographic distribution of species was kindled by a stop at the. Galapagos islands near the equator west of south america. *each island had different type of food available and a different type of bird. *darwin noted that humans have modified other species by selecting and breeding individuals with desired traits. Darwin proposed that similar selection may have occurred naturally over millions of years, creating new species. *natural selection does not create new traits, but selects for traits already present in the population. *the local environment determines which traits will be selected for or selected against in any specific population. *the study of fossils helped to lay the groundwork for darwin"s ideas.
