Lecture 2.docx

He found each island has different species of finch

Info icon This preview shows pages 1–3. Sign up to view the full content.

He found each island has different species of finch Those who had adaptations that helped them live in their environments, outlived those who didn’t Darwin’s Puzzle Variation Organisms vary in phenotypic quality We all have similarities, but how we look and express traits we have is different It happens in all species, for ex: birds have diff wing length, trunk strength, etc
Image of page 1

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

Inheritance Variations are thought of phenotypes Lamark believed all traits are inherited Darwin didn’t believe same thing as larmark, only some traits would be inherited and only those who were inherited played a role in evolution Its mostly genetics, not epigenetics that are a mode of inheritance Selection Survival Survival only matters so much to help us reproduce, it has little to do with evolution Reproduction is driving force of evolution NOT survival Heritable traits are those passed on by genes Conspecific are members of the same species Darwin’s Theory of Sexual Selection Rare to see peacocks fly: tails are costly in energy hard for them to fly Why have tails if they are costly? Darwin didn’t get it so why did it evolve? Sexual selection Sexual selection is natural selection that acts differently on different sexes they are NOT different things, one is a special case of the other Darwin’s theory of SS originated from the fact that there are structures that don’t help survival/reproduce How do we get so much differentiation among sexes when they have the same problems in the same environment: food, predators, diseases
Image of page 2
Image of page 3
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