{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

huelsenbeck11notes

huelsenbeck11notes - Lecture 11 Monday Macroevolution and...

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

View Full Document Right Arrow Icon
Lecture 11 Monday, March 30, 2009 Macroevolution and microevolution Microevolution is the process of change in individual species. Macroevolution is evolutionary change above the species level, including the formation of species, the diversification of species, and the appearance of major evolutionary developments. One of the important questions in evolutionary biology is how well macroevolutionary patterns can be predicted from our understanding of microevolution. The punctuated equilibrium theory Pattern: The punctuated equilibrium theory is a generalization about the pattern of evolution as seen in the fossil record. The pattern is the stasis of established wide-spread lineages and morphological change when new species appear. The two are compared in Fig. 24.13. What is not seen very often in the fossil record is gradual and continuous change in widespread species. Darwin’s explanation for not seeing this pattern was the imperfection of the fossil record. Even when the fossil record of some groups is more complete, the punctuated equilibrium pattern instead of a gradual pattern is often found. The fossil record of humans and their immediate ancestors, which
Image of page 1

Info icon This 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