huelsenbeck11notes - Lecture 11 Monday Macroevolution and...

Info iconThis 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
Background image of page 1

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

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

This note was uploaded on 05/13/2009 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

Page1 / 3

huelsenbeck11notes - Lecture 11 Monday Macroevolution and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online