Bio notes 1 - Zhaonan Liu Bio 101 Lecture 1"Nothing in...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Zhaonan Liu August 23, 2007 Bio 101 Lecture 1 “Nothing in biology makes sense except in the light of evolution” - Theodosius Dobzhansky (1900-1975) Evidence of Evolution prior to Darwin (1859) Organisms appear unchanging (uniformitarianism) Literal interpretation of Genesis puts origin of life at 4004 BCE 19th century geologists, e.g. Charles Lyell : earth is much older: Layered rock seen as sediments, deposited gradually. Now, radiometric dating, puts oldest rocks at 4+ billion years. Fossils : Fossils were much older than 4004 BCE Some organisms (clams, turtles) appear unchanged for millions of years Others (horses) leave a complete fossil record of gradual change Finally, some (trilobites, dinosaurs) appear then disappear from earth Modern Biology begins with Darwin (1859) 1. Evidence for evolutionary change 2. The agent for change: natural selection Darwin’s Evidence for Change 1 . Geological evidence : Fossil record contains many organisms that are now extinct that reveal gradual changes over time (modern forms may not appear in fossil record) ex. Horse leg, digits change from 5 to 1
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern