EEB211 Evolution notes - Lecture 2 Evolution Monday 11:00...

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

Evolution is different from natural selection Evolution: Change in allele freq. from one gen to the next This can be any change (even if it’s from 11% to 12%) E.g. phenotype proportion change (change in size of tails or physical feature from x to y) Grand Canyon is proof that the earth has existed for a long time (Neptunists theory belief that massive precipitation caused the formation of canyons (carved out the earth) -> suggested evolution. James Hutton noticed sedimentary rocks (laid down in an unusual way (horizontal/vertical layers) suggests earth was millions of year’s old due to erosion and layer buildup etc….. (Something caused the layers to rotate 90 degrees). Fossils: people did not assume they were extinct thought they were alive (most of the earth s surface had not been looked at carefully) Presence of dinosaur bones suggested that they were extinct caused further exploration of extinction/evolution. Irish elk/mammoths were extinct relatively closer to the present (mammoths that were frozen provided more details) Pelvis of the horse and blue whale – horses use them, but blue whales don’t – this suggests that blue whales had legs (pelvis = vestigial organs of whales) Another example: snakes have claws (vestigial ones), human embryo tail/gill slits (these are reabsorbed) Recurrent nerve: biological equivalent of continental drift? / Not necessary e.g. giraffe has one that is 15feet long. Homology [KO1] , comparing turtles, horses, humans, seal, birds, bats and horses they all have relatively similar bone parts Best example of homology is the genetic code Crypsis [KO2] (it is a mimicry [KO3] )
Image of page 1

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

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