Chapter 1 Adaptation by Natural Selection

Chapter 1 Adaptation by Natural Selection - Chapter 1...

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

View Full Document Right Arrow Icon
Chapter 1: Adaptation by Natural Selection Explaining Adaptation before Darwin - The human eye is a complex structure that is specifically adapted to our environment - Any substantial changes in the structure of the eye would keep the eye from functioning - During Darwin’s time, many people believed that the eye had come about by divine creation o William Paley, Natural Theology , 1802 o The structure was too complex to randomly come about through natural processes so Paley though that an intelligent creator, God, had designed the eye. Darwin’s theory of Adaptation - Darwin’s postulates: o Although adaptations are constantly expanding, there comes a point where the environment can support no more. “struggle for existence” o Organisms within populations vary, and this variation can affect the ability of the organism to survive and reproduce o This variation is passed down through generations - This process is known as natural selection or evolution by variation and selective retention - Peter and Rosemary Grant studied one species of Darwin’s finches noting their size, weight, etc. o A few years into their study, there was a drought that led to a shortage of small seeds The population decreased from 1200 to 800 The environment could not support the population The beak size increased
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